diff --git a/boot.php b/boot.php
index b45bc5767..03a376165 100644
--- a/boot.php
+++ b/boot.php
@@ -866,7 +866,7 @@ function goaway($path)
  */
 function local_user()
 {
-	if (x($_SESSION, 'authenticated') && x($_SESSION, 'uid')) {
+	if (!empty($_SESSION['authenticated']) && !empty($_SESSION['uid'])) {
 		return intval($_SESSION['uid']);
 	}
 	return false;
@@ -909,6 +909,11 @@ function remote_user()
 //	if (local_user()) {
 //		return false;
 //	}
+
+	if (empty($_SESSION)) {
+		return false;
+	}
+
 	if (x($_SESSION, 'authenticated') && x($_SESSION, 'visitor_id')) {
 		return intval($_SESSION['visitor_id']);
 	}
diff --git a/include/api.php b/include/api.php
index dd8daa9e6..4e8e9c232 100644
--- a/include/api.php
+++ b/include/api.php
@@ -169,7 +169,8 @@ function api_login(App $a)
 	$oauth1 = new FKOAuth1();
 	// login with oauth
 	try {
-		list($consumer, $token) = $oauth1->verify_request(OAuthRequest::from_request());
+		$request = OAuthRequest::from_request();
+		list($consumer, $token) = $oauth1->verify_request($request);
 		if (!is_null($token)) {
 			$oauth1->loginUser($token->uid);
 			Addon::callHooks('logged_in', $a->user);
diff --git a/include/conversation.php b/include/conversation.php
index 5ce02a55f..de7a13626 100644
--- a/include/conversation.php
+++ b/include/conversation.php
@@ -349,7 +349,10 @@ function localize_item(&$item)
 	// add sparkle links to appropriate permalinks
 	$author = ['uid' => 0, 'id' => $item['author-id'],
 		'network' => $item['author-network'], 'url' => $item['author-link']];
-	$item['plink'] = Contact::magicLinkbyContact($author, $item['plink']);
+
+	if (!empty($item['plink'])) {
+		$item['plink'] = Contact::magicLinkbyContact($author, $item['plink']);
+	}
 }
 
 /**
@@ -482,7 +485,7 @@ function conversation(App $a, $items, $mode, $update, $preview = false, $order =
 		$profile_owner = $a->profile['uid'];
 		if (!$update) {
 			$live_update_div = '<div id="live-display"></div>' . "\r\n"
-				. "<script> var profile_uid = " . $_SESSION['uid'] . ";"
+				. "<script> var profile_uid = " . defaults($_SESSION, 'uid', 0) . ";"
 				. " var profile_page = 1; </script>";
 		}
 	} elseif ($mode === 'community') {
@@ -631,8 +634,8 @@ function conversation(App $a, $items, $mode, $update, $preview = false, $order =
 
 				$tmp_item = [
 					'template' => $tpl,
-					'id' => (($preview) ? 'P0' : $item['item_id']),
-					'guid' => (($preview) ? 'Q0' : $item['guid']),
+					'id' => ($preview ? 'P0' : $item['id']),
+					'guid' => ($preview ? 'Q0' : $item['guid']),
 					'network' => $item['network'],
 					'network_name' => ContactSelector::networkToName($item['network'], $profile_link),
 					'linktitle' => L10n::t('View %s\'s profile @ %s', $profile_name, $item['author-link']),
@@ -679,7 +682,7 @@ function conversation(App $a, $items, $mode, $update, $preview = false, $order =
 				$arr = ['item' => $item, 'output' => $tmp_item];
 				Addon::callHooks('display_item', $arr);
 
-				$threads[$threadsid]['id'] = $item['item_id'];
+				$threads[$threadsid]['id'] = $item['id'];
 				$threads[$threadsid]['network'] = $item['network'];
 				$threads[$threadsid]['items'] = [$arr['output']];
 
diff --git a/include/enotify.php b/include/enotify.php
index f33b16f50..a19693816 100644
--- a/include/enotify.php
+++ b/include/enotify.php
@@ -34,7 +34,7 @@ function notification($params)
 	$siteurl = System::baseUrl(true);
 	$thanks = L10n::t('Thank You,');
 	$sitename = $a->config['sitename'];
-	if (!x($a->config['admin_name'])) {
+	if (empty($a->config['admin_name'])) {
 		$site_admin = L10n::t('%s Administrator', $sitename);
 	} else {
 		$site_admin = L10n::t('%1$s, %2$s Administrator', $a->config['admin_name'], $sitename);
@@ -93,6 +93,8 @@ function notification($params)
 	}
 
 	if ($params['type'] == NOTIFY_MAIL) {
+		$itemlink = $siteurl.'/message/'.$params['item']['id'];
+
 		$subject = L10n::t('[Friendica:Notify] New mail received at %s', $sitename);
 
 		$preamble = L10n::t('%1$s sent you a new private message at %2$s.', $params['source_name'], $sitename);
@@ -101,7 +103,6 @@ function notification($params)
 		$sitelink = L10n::t('Please visit %s to view and/or reply to your private messages.');
 		$tsitelink = sprintf($sitelink, $siteurl.'/message/'.$params['item']['id']);
 		$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'/message/'.$params['item']['id'].'">'.$sitename.'</a>');
-		$itemlink = $siteurl.'/message/'.$params['item']['id'];
 	}
 
 	if ($params['type'] == NOTIFY_COMMENT) {
@@ -130,10 +131,11 @@ function notification($params)
 		$item = null;
 
 		if ($params['otype'] === 'item' && $parent_id) {
-			$item = Item::selectFirstForUser($params['uid'], [], ['id' => $parent_id]);
+			$item = Item::selectFirstForUser($params['uid'], Item::ITEM_FIELDLIST, ['id' => $parent_id]);
 		}
 
 		$item_post_type = item_post_type($item);
+		$itemlink = $item['plink'];
 
 		// "a post"
 		$dest_str = L10n::t('%1$s commented on [url=%2$s]a %3$s[/url]',
@@ -242,6 +244,7 @@ function notification($params)
 	}
 
 	if ($params['type'] == NOTIFY_TAGSHARE) {
+		$itemlink =  $params['link'];
 		$subject = L10n::t('[Friendica:Notify] %s tagged your post', $params['source_name']);
 
 		$preamble = L10n::t('%1$s tagged your post at %2$s', $params['source_name'], $sitename);
@@ -253,10 +256,10 @@ function notification($params)
 		$sitelink = L10n::t('Please visit %s to view and/or reply to the conversation.');
 		$tsitelink = sprintf($sitelink, $siteurl);
 		$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'">'.$sitename.'</a>');
-		$itemlink =  $params['link'];
 	}
 
 	if ($params['type'] == NOTIFY_INTRO) {
+		$itemlink = $params['link'];
 		$subject = L10n::t('[Friendica:Notify] Introduction received');
 
 		$preamble = L10n::t('You\'ve received an introduction from \'%1$s\' at %2$s', $params['source_name'], $sitename);
@@ -270,7 +273,6 @@ function notification($params)
 		$sitelink = L10n::t('Please visit %s to approve or reject the introduction.');
 		$tsitelink = sprintf($sitelink, $siteurl);
 		$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'">'.$sitename.'</a>');
-		$itemlink =  $params['link'];
 
 		switch ($params['verb']) {
 			case ACTIVITY_FRIEND:
@@ -300,6 +302,7 @@ function notification($params)
 	}
 
 	if ($params['type'] == NOTIFY_SUGGEST) {
+		$itemlink =  $params['link'];
 		$subject = L10n::t('[Friendica:Notify] Friend suggestion received');
 
 		$preamble = L10n::t('You\'ve received a friend suggestion from \'%1$s\' at %2$s', $params['source_name'], $sitename);
@@ -316,11 +319,11 @@ function notification($params)
 		$sitelink = L10n::t('Please visit %s to approve or reject the suggestion.');
 		$tsitelink = sprintf($sitelink, $siteurl);
 		$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'">'.$sitename.'</a>');
-		$itemlink =  $params['link'];
 	}
 
 	if ($params['type'] == NOTIFY_CONFIRM) {
 		if ($params['verb'] == ACTIVITY_FRIEND) { // mutual connection
+			$itemlink =  $params['link'];
 			$subject = L10n::t('[Friendica:Notify] Connection accepted');
 
 			$preamble = L10n::t('\'%1$s\' has accepted your connection request at %2$s', $params['source_name'], $sitename);
@@ -334,8 +337,8 @@ function notification($params)
 			$sitelink = L10n::t('Please visit %s if you wish to make any changes to this relationship.');
 			$tsitelink = sprintf($sitelink, $siteurl);
 			$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'">'.$sitename.'</a>');
-			$itemlink =  $params['link'];
 		} else { // ACTIVITY_FOLLOW
+			$itemlink =  $params['link'];
 			$subject = L10n::t('[Friendica:Notify] Connection accepted');
 
 			$preamble = L10n::t('\'%1$s\' has accepted your connection request at %2$s', $params['source_name'], $sitename);
@@ -351,13 +354,13 @@ function notification($params)
 			$sitelink = L10n::t('Please visit %s  if you wish to make any changes to this relationship.');
 			$tsitelink = sprintf($sitelink, $siteurl);
 			$hsitelink = sprintf($sitelink, '<a href="'.$siteurl.'">'.$sitename.'</a>');
-			$itemlink =  $params['link'];
 		}
 	}
 
 	if ($params['type'] == NOTIFY_SYSTEM) {
 		switch($params['event']) {
 			case "SYSTEM_REGISTER_REQUEST":
+				$itemlink =  $params['link'];
 				$subject = L10n::t('[Friendica System Notify]') . ' ' . L10n::t('registration request');
 
 				$preamble = L10n::t('You\'ve received a registration request from \'%1$s\' at %2$s', $params['source_name'], $sitename);
@@ -375,7 +378,6 @@ function notification($params)
 				$sitelink = L10n::t('Please visit %s to approve or reject the request.');
 				$tsitelink = sprintf($sitelink, $params['link']);
 				$hsitelink = sprintf($sitelink, '<a href="'.$params['link'].'">'.$sitename.'</a><br><br>');
-				$itemlink =  $params['link'];
 				break;
 			case "SYSTEM_DB_UPDATE_FAIL":
 				break;
@@ -572,7 +574,7 @@ function notification($params)
 		$datarray['sitename'] = $sitename;
 		$datarray['siteurl'] = $siteurl;
 		$datarray['type'] = $params['type'];
-		$datarray['parent'] = $params['parent'];
+		$datarray['parent'] = $parent_id;
 		$datarray['source_name'] = $params['source_name'];
 		$datarray['source_link'] = $params['source_link'];
 		$datarray['source_photo'] = $params['source_photo'];
@@ -607,7 +609,7 @@ function notification($params)
 			'$source_name'  => $datarray['source_name'],
 			'$source_link'  => $datarray['source_link'],
 			'$source_photo' => $datarray['source_photo'],
-			'$username'     => $datarray['to_name'],
+			'$username'     => $datarray['username'],
 			'$hsitelink'    => $datarray['hsitelink'],
 			'$hitemlink'    => $datarray['hitemlink'],
 			'$thanks'       => $datarray['thanks'],
@@ -628,7 +630,7 @@ function notification($params)
 			'$source_name'  => $datarray['source_name'],
 			'$source_link'  => $datarray['source_link'],
 			'$source_photo' => $datarray['source_photo'],
-			'$username'     => $datarray['to_name'],
+			'$username'     => $datarray['username'],
 			'$tsitelink'    => $datarray['tsitelink'],
 			'$titemlink'    => $datarray['titemlink'],
 			'$thanks'       => $datarray['thanks'],
diff --git a/include/items.php b/include/items.php
index ee514c8fc..ab50e159a 100644
--- a/include/items.php
+++ b/include/items.php
@@ -33,6 +33,8 @@ function add_page_info_data($data, $no_photos = false) {
 		$data["type"] = "link";
 	}
 
+	$data["title"] = defaults($data, "title", "");
+
 	if ((($data["type"] != "link") && ($data["type"] != "video") && ($data["type"] != "photo")) || ($data["title"] == $data["url"])) {
 		return "";
 	}
@@ -47,19 +49,19 @@ function add_page_info_data($data, $no_photos = false) {
 
 	$text = "[attachment type='".$data["type"]."'";
 
-	if ($data["text"] == "") {
+	if (empty($data["text"])) {
 		$data["text"] = $data["title"];
 	}
 
-	if ($data["text"] == "") {
+	if (empty($data["text"])) {
 		$data["text"] = $data["url"];
 	}
 
-	if ($data["url"] != "") {
+	if (!empty($data["url"])) {
 		$text .= " url='".$data["url"]."'";
 	}
 
-	if ($data["title"] != "") {
+	if (!empty($data["title"])) {
 		$text .= " title='".$data["title"]."'";
 	}
 
@@ -427,7 +429,7 @@ function list_post_dates($uid, $wall) {
 		$start_month = DateTimeFormat::utc($dstart, 'Y-m-d');
 		$end_month = DateTimeFormat::utc($dend, 'Y-m-d');
 		$str = day_translate(DateTimeFormat::utc($dnow, 'F'));
-		if (!$ret[$dyear]) {
+		if (empty($ret[$dyear])) {
 			$ret[$dyear] = [];
 		}
 		$ret[$dyear][] = [$str, $end_month, $start_month];
diff --git a/include/text.php b/include/text.php
index 0957d92d7..d6b40dcc2 100644
--- a/include/text.php
+++ b/include/text.php
@@ -643,13 +643,20 @@ function logger($msg, $level = 0) {
 	}
 
 	$callers = debug_backtrace();
+
+	if (count($callers) > 1) {
+		$function = $callers[1]['function'];
+	} else {
+		$function = '';
+	}
+
 	$logline = sprintf("%s@%s\t[%s]:%s:%s:%s\t%s\n",
 			DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 			$process_id,
 			$LOGGER_LEVELS[$level],
 			basename($callers[0]['file']),
 			$callers[0]['line'],
-			$callers[1]['function'],
+			$function,
 			$msg
 		);
 
@@ -1280,7 +1287,8 @@ function prepare_body(array &$item, $attach = false, $is_preview = false)
 				]);
 			}
 
-			$id = end(explode('/', $the_url));
+			$url_parts = explode('/', $the_url);
+			$id = end($url_parts);
 			$as .= replace_macros(get_markup_template('video_top.tpl'), [
 				'$video' => [
 					'id'     => $id,
@@ -1710,11 +1718,11 @@ function reltoabs($text, $base) {
  * @return string
  */
 function item_post_type($item) {
-	if (intval($item['event-id'])) {
+	if (!empty($item['event-id'])) {
 		return L10n::t('event');
-	} elseif (strlen($item['resource-id'])) {
+	} elseif (!empty($item['resource-id'])) {
 		return L10n::t('photo');
-	} elseif (strlen($item['verb']) && $item['verb'] !== ACTIVITY_POST) {
+	} elseif (!empty($item['verb']) && $item['verb'] !== ACTIVITY_POST) {
 		return L10n::t('activity');
 	} elseif ($item['id'] != $item['parent']) {
 		return L10n::t('comment');
diff --git a/index.php b/index.php
index f65867feb..ed558e5fe 100644
--- a/index.php
+++ b/index.php
@@ -128,7 +128,7 @@ if ((x($_GET,'zrl')) && $a->mode == App::MODE_NORMAL) {
 		// Valid profile links contain a path with "/profile/" and no query parameters
 		if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == "") &&
 			strstr(parse_url($_GET['zrl'], PHP_URL_PATH), "/profile/")) {
-			if ($_SESSION["visitor_home"] != $_GET["zrl"]) {
+			if (defaults($_SESSION, "visitor_home", "") != $_GET["zrl"]) {
 				$_SESSION['my_url'] = $_GET['zrl'];
 				$_SESSION['authenticated'] = 0;
 			}
diff --git a/library/asn1.php b/library/asn1.php
index ac14a5b16..cda96b6c8 100644
--- a/library/asn1.php
+++ b/library/asn1.php
@@ -156,7 +156,7 @@ class ASN_BASE {
 				if (($length & ASN_LONG_LEN)==ASN_LONG_LEN){
 					$tempLength = 0;
 					for ($x=0; $x<($length & (ASN_LONG_LEN-1)); $x++){
-						$tempLength = ord($string[$p++]) + ($tempLength * 256);
+						$tempLength = @ord($string[$p++]) + ($tempLength * 256);
 					}
 					$length = $tempLength;
 				}
diff --git a/mod/dfrn_notify.php b/mod/dfrn_notify.php
index 10a0a792a..bfbf4c657 100644
--- a/mod/dfrn_notify.php
+++ b/mod/dfrn_notify.php
@@ -265,6 +265,8 @@ function dfrn_dispatch_private($user, $postdata)
 	// Set the user id. This is important if this is a public contact
 	$importer['importer_uid']  = $user['uid'];
 
+	$importer = array_merge($importer, $user);
+
 	logger('Importing post from ' . $msg['author'] . ' to ' . $user['nickname'] . ' with the private envelope.', LOGGER_DEBUG);
 
 	// Now we should be able to import it
@@ -333,7 +335,8 @@ function dfrn_notify_content(App $a) {
 		);
 
 		if (!DBM::is_result($r)) {
-			$status = 1;
+			logger('No user data found for ' . $a->argv[1] . ' - SQL: ' . $sql_extra);
+			killme();
 		}
 
 		logger("Remote rino version: ".$rino_remote." for ".$r[0]["url"], LOGGER_DATA);
diff --git a/mod/dirfind.php b/mod/dirfind.php
index dc86f03a6..d72c2d43d 100644
--- a/mod/dirfind.php
+++ b/mod/dirfind.php
@@ -185,7 +185,7 @@ function dirfind_content(App $a, $prefix = "") {
 			$a->set_pager_itemspage($j->items_page);
 		}
 
-		if (count($j->results)) {
+		if (!empty($j->results)) {
 
 			$id = 0;
 
diff --git a/mod/display.php b/mod/display.php
index 1f2e18708..23f0492c6 100644
--- a/mod/display.php
+++ b/mod/display.php
@@ -140,29 +140,29 @@ function display_fetchauthor($a, $item)
 	if (!$skip) {
 		$author = "";
 		preg_match("/author='(.*?)'/ism", $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["name"] = html_entity_decode($matches[1],ENT_QUOTES,'UTF-8');
 		}
 		preg_match('/author="(.*?)"/ism', $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["name"] = html_entity_decode($matches[1],ENT_QUOTES,'UTF-8');
 		}
 		$profile = "";
 		preg_match("/profile='(.*?)'/ism", $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["url"] = $matches[1];
 		}
 		preg_match('/profile="(.*?)"/ism', $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["url"] = $matches[1];
 		}
 		$avatar = "";
 		preg_match("/avatar='(.*?)'/ism", $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["photo"] = $matches[1];
 		}
 		preg_match('/avatar="(.*?)"/ism', $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profiledata["photo"] = $matches[1];
 		}
 		$profiledata["nickname"] = $profiledata["name"];
@@ -212,6 +212,7 @@ function display_content(App $a, $update = false, $update_uid = 0)
 		$item_parent_uri = $item['parent-uri'];
 	} else {
 		$item_id = (($a->argc > 2) ? $a->argv[2] : 0);
+		$item_parent = $item_id;
 
 		if ($a->argc == 2) {
 			$item_parent = 0;
diff --git a/mod/fetch.php b/mod/fetch.php
index da616ad5b..5f1b24a79 100644
--- a/mod/fetch.php
+++ b/mod/fetch.php
@@ -23,7 +23,8 @@ function fetch_init(App $a)
 	$guid = $a->argv[2];
 
 	// Fetch the item
-	$fields = ['uid', 'title', 'body', 'guid', 'contact-id', 'private', 'created', 'app', 'location', 'coord', 'network'];
+	$fields = ['uid', 'title', 'body', 'guid', 'contact-id', 'private', 'created', 'app', 'location', 'coord', 'network',
+		'event-id', 'resource-id', 'author-link', 'owner-link', 'attach'];
 	$condition = ['wall' => true, 'private' => false, 'guid' => $guid, 'network' => [NETWORK_DFRN, NETWORK_DIASPORA]];
 	$item = Item::selectFirst($fields, $condition);
 	if (!DBM::is_result($item)) {
diff --git a/mod/item.php b/mod/item.php
index 4e27a80cf..935b50d03 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -219,10 +219,10 @@ function item_post(App $a) {
 			$str_contact_deny  = $user['deny_cid'];
 		} else {
 			// use the posted permissions
-			$str_group_allow   = perms2str($_REQUEST['group_allow']);
-			$str_contact_allow = perms2str($_REQUEST['contact_allow']);
-			$str_group_deny    = perms2str($_REQUEST['group_deny']);
-			$str_contact_deny  = perms2str($_REQUEST['contact_deny']);
+			$str_group_allow   = perms2str(defaults($_REQUEST, 'group_allow', ''));
+			$str_contact_allow = perms2str(defaults($_REQUEST, 'contact_allow', ''));
+			$str_group_deny    = perms2str(defaults($_REQUEST, 'group_deny', ''));
+			$str_contact_deny  = perms2str(defaults($_REQUEST, 'contact_deny', ''));
 		}
 
 		$title             =      notags(trim(defaults($_REQUEST, 'title'   , '')));
@@ -245,7 +245,6 @@ function item_post(App $a) {
 		// If this is a comment, set the permissions from the parent.
 
 		if ($parent_item) {
-
 			// for non native networks use the network of the original post as network of the item
 			if (($parent_item['network'] != NETWORK_DIASPORA)
 				&& ($parent_item['network'] != NETWORK_OSTATUS)
@@ -651,16 +650,18 @@ function item_post(App $a) {
 
 	$conversation = dba::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $datarray['parent-uri']]);
 	if (DBM::is_result($conversation)) {
-		if ($r['conversation-uri'] != '') {
+		if ($conversation['conversation-uri'] != '') {
 			$datarray['conversation-uri'] = $conversation['conversation-uri'];
 		}
-		if ($r['conversation-href'] != '') {
+		if ($conversation['conversation-href'] != '') {
 			$datarray['conversation-href'] = $conversation['conversation-href'];
 		}
 	}
 
 	if ($orig_post) {
 		$datarray['edit'] = true;
+	} else {
+		$datarray['edit'] = false;
 	}
 
 	// Check for hashtags in the body and repair or add hashtag links
@@ -674,6 +675,9 @@ function item_post(App $a) {
 		// We set the datarray ID to -1 because in preview mode the dataray
 		// doesn't have an ID.
 		$datarray["id"] = -1;
+		$datarray["item_id"] = -1;
+		$datarray["author-network"] = NETWORK_DFRN;
+
 		$o = conversation($a,[array_merge($contact_record,$datarray)],'search', false, true);
 		logger('preview: ' . $o);
 		echo json_encode(['preview' => $o]);
diff --git a/mod/message.php b/mod/message.php
index ddd5d03d6..b414fe0e4 100644
--- a/mod/message.php
+++ b/mod/message.php
@@ -118,7 +118,7 @@ function message_content(App $a)
 		}
 
 		// Check if we should do HTML-based delete confirmation
-		if ($_REQUEST['confirm']) {
+		if (!empty($_REQUEST['confirm'])) {
 			// <form> can't take arguments in its "action" parameter
 			// so add any arguments as hidden inputs
 			$query = explode_querystring($a->query_string);
@@ -143,7 +143,7 @@ function message_content(App $a)
 		}
 
 		// Now check how the user responded to the confirmation query
-		if ($_REQUEST['canceled']) {
+		if (!empty($_REQUEST['canceled'])) {
 			goaway($_SESSION['return_url']);
 		}
 
@@ -308,8 +308,10 @@ function message_content(App $a)
 				WHERE `mail`.`uid` = %d $sql_extra ORDER BY `mail`.`created` ASC",
 				intval(local_user())
 			);
+		} else {
+			$messages = false;
 		}
-		if (!count($messages)) {
+		if (!DBM::is_result($messages)) {
 			notice(L10n::t('Message not available.') . EOL);
 			return $o;
 		}
diff --git a/mod/network.php b/mod/network.php
index 98ffd741f..154332f7d 100644
--- a/mod/network.php
+++ b/mod/network.php
@@ -833,7 +833,7 @@ function networkThreadedView(App $a, $update, $parent)
 			$top_limit = DateTimeFormat::utcNow();
 		}
 
-		$items = dba::p("SELECT `item`.`parent-uri` AS `uri`, 0 AS `item_id`, `item`.$ordering AS `order_date` FROM `item`
+		$items = dba::p("SELECT `item`.`parent-uri` AS `uri`, 0 AS `item_id`, `item`.$ordering AS `order_date`, `author`.`url` AS `author-link` FROM `item`
 			STRAIGHT_JOIN (SELECT `oid` FROM `term` WHERE `term` IN
 				(SELECT SUBSTR(`term`, 2) FROM `search` WHERE `uid` = ? AND `term` LIKE '#%') AND `otype` = ? AND `type` = ? AND `uid` = 0) AS `term`
 			ON `item`.`id` = `term`.`oid`
diff --git a/mod/notifications.php b/mod/notifications.php
index 7b63a8dd0..b113be030 100644
--- a/mod/notifications.php
+++ b/mod/notifications.php
@@ -79,6 +79,7 @@ function notifications_content(App $a)
 	// Get the nav tabs for the notification pages
 	$tabs = $nm->getTabs();
 	$notif_content = [];
+	$notif_nocontent = '';
 
 	// Notification results per page
 	$perpage = 20;
@@ -184,7 +185,11 @@ function notifications_content(App $a)
 					$dfrn_tpl = get_markup_template('netfriend.tpl');
 
 					$knowyou   = '';
+					$lbl_knowyou = '';
 					$dfrn_text = '';
+					$helptext = '';
+					$helptext2 = '';
+					$helptext3 = '';
 
 					if ($it['network'] === NETWORK_DFRN || $it['network'] === NETWORK_DIASPORA) {
 						if ($it['network'] === NETWORK_DFRN) {
diff --git a/mod/photo.php b/mod/photo.php
index e899d671d..653802d30 100644
--- a/mod/photo.php
+++ b/mod/photo.php
@@ -39,7 +39,9 @@ function photo_init(App $a)
 	if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
 		header('HTTP/1.1 304 Not Modified');
 		header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
-		header('Etag: ' . $_SERVER['HTTP_IF_NONE_MATCH']);
+		if (!empty($_SERVER['HTTP_IF_NONE_MATCH'])) {
+			header('Etag: ' . $_SERVER['HTTP_IF_NONE_MATCH']);
+		}
 		header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
 		header("Cache-Control: max-age=31536000");
 		if (function_exists('header_remove')) {
diff --git a/mod/photos.php b/mod/photos.php
index d969fd327..7c5f539d0 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -101,6 +101,8 @@ function photos_init(App $a) {
 
 		if (local_user() && $a->data['user']['uid'] == local_user()) {
 			$can_post = true;
+		} else {
+			$can_post = false;
 		}
 
 		if ($ret['success']) {
@@ -950,6 +952,7 @@ function photos_content(App $a)
 	$contact        = null;
 	$remote_contact = false;
 	$contact_id     = 0;
+	$edit           = false;
 
 	$owner_uid = $a->data['user']['uid'];
 
diff --git a/mod/ping.php b/mod/ping.php
index cbd280f53..196758b0d 100644
--- a/mod/ping.php
+++ b/mod/ping.php
@@ -278,6 +278,7 @@ function ping_init(App $a)
 		if (DBM::is_result($intros)) {
 			foreach ($intros as $intro) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/notifications/intros/' . $intro['id'],
 					'name'    => $intro['name'],
 					'url'     => $intro['url'],
@@ -293,6 +294,7 @@ function ping_init(App $a)
 		if (DBM::is_result($mails)) {
 			foreach ($mails as $mail) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/message/' . $mail['id'],
 					'name'    => $mail['from-name'],
 					'url'     => $mail['from-url'],
@@ -308,6 +310,7 @@ function ping_init(App $a)
 		if (DBM::is_result($regs)) {
 			foreach ($regs as $reg) {
 				$notif = [
+					'id'      => 0,
 					'href'    => System::baseUrl() . '/admin/users/',
 					'name'    => $reg['name'],
 					'url'     => $reg['url'],
diff --git a/mod/poco.php b/mod/poco.php
index de3b42bb7..d263afc9a 100644
--- a/mod/poco.php
+++ b/mod/poco.php
@@ -23,9 +23,9 @@ function poco_init(App $a) {
 	if ($a->argc > 1) {
 		$user = notags(trim($a->argv[1]));
 	}
-	if (! x($user)) {
+	if (empty($user)) {
 		$c = q("SELECT * FROM `pconfig` WHERE `cat` = 'system' AND `k` = 'suggestme' AND `v` = 1");
-		if (! DBM::is_result($c)) {
+		if (!DBM::is_result($c)) {
 			System::httpExit(401);
 		}
 		$system_mode = true;
diff --git a/mod/profile.php b/mod/profile.php
index 93172397b..60741db72 100644
--- a/mod/profile.php
+++ b/mod/profile.php
@@ -282,6 +282,8 @@ function profile_content(App $a, $update = 0)
 
 		if (!DBM::is_result($r)) {
 			$sql_extra3 = sprintf(" AND `thread`.`contact-id` = %d ", intval(intval($a->profile['contact_id'])));
+		} else {
+			$sql_extra3 = "";
 		}
 
 		//  check if we serve a mobile device and get the user settings
diff --git a/mod/search.php b/mod/search.php
index 974680d2a..8f89e7200 100644
--- a/mod/search.php
+++ b/mod/search.php
@@ -74,6 +74,11 @@ function search_init(App $a) {
 			dba::delete('search', ['uid' => local_user(), 'term' => $search]);
 		}
 
+		/// @todo Check if there is a case at all that "aside" is prefilled here
+		if (!isset($a->page['aside'])) {
+			$a->page['aside'] = '';
+		}
+
 		$a->page['aside'] .= search_saved_searches();
 
 	} else {
diff --git a/mod/xrd.php b/mod/xrd.php
index d251d41fe..29ee1057a 100644
--- a/mod/xrd.php
+++ b/mod/xrd.php
@@ -12,14 +12,14 @@ function xrd_init(App $a)
 {
 	if ($a->argv[0] == 'xrd') {
 		$uri = urldecode(notags(trim($_GET['uri'])));
-		if ($_SERVER['HTTP_ACCEPT'] == 'application/jrd+json') {
+		if (defaults($_SERVER, 'HTTP_ACCEPT', '') == 'application/jrd+json') {
 			$mode = 'json';
 		} else {
 			$mode = 'xml';
 		}
 	} else {
 		$uri = urldecode(notags(trim($_GET['resource'])));
-		if ($_SERVER['HTTP_ACCEPT'] == 'application/xrd+xml') {
+		if (defaults($_SERVER, 'HTTP_ACCEPT', '') == 'application/xrd+xml') {
 			$mode = 'xml';
 		} else {
 			$mode = 'json';
diff --git a/src/App.php b/src/App.php
index a2bdd03df..097b5e541 100644
--- a/src/App.php
+++ b/src/App.php
@@ -174,7 +174,21 @@ class App
 		$this->callstack['parser'] = [];
 
 		$this->config = [];
-		$this->page = [];
+
+		$this->page = [
+			'aside' => '',
+			'bottom' => '',
+			'content' => '',
+			'end' => '',
+			'footer' => '',
+			'htmlhead' => '',
+			'nav' => '',
+			'page_title' => '',
+			'right_aside' => '',
+			'template' => '',
+			'title' => ''
+		];
+
 		$this->pager = [];
 
 		$this->query_string = '';
@@ -1154,7 +1168,12 @@ class App
 			}
 		}
 
-		$user_theme = defaults($_SESSION, 'theme', $system_theme);
+		if (!empty($_SESSION)) {
+			$user_theme = defaults($_SESSION, 'theme', $system_theme);
+		} else {
+			$user_theme = $system_theme;
+		}
+
 		// Specific mobile theme override
 		if (($this->is_mobile || $this->is_tablet) && defaults($_SESSION, 'show-mobile', true)) {
 			$system_mobile_theme = Config::get('system', 'mobile-theme');
diff --git a/src/Content/OEmbed.php b/src/Content/OEmbed.php
index b09fd2249..360a0dc48 100644
--- a/src/Content/OEmbed.php
+++ b/src/Content/OEmbed.php
@@ -108,7 +108,7 @@ class OEmbed
 				$txt = '{"type":"error"}';
 			} else { //save in cache
 				$j = json_decode($txt);
-				if ($j->type != "error") {
+				if (!empty($j->type) && $j->type != "error") {
 					dba::insert('oembed', [
 						'url' => normalise_link($embedurl),
 						'maxwidth' => $a->videowidth,
diff --git a/src/Content/Text/BBCode.php b/src/Content/Text/BBCode.php
index b4270fec6..72d20da17 100644
--- a/src/Content/Text/BBCode.php
+++ b/src/Content/Text/BBCode.php
@@ -540,7 +540,7 @@ class BBCode extends BaseObject
 	private static function convertAttachment($return, $simplehtml = false, $tryoembed = true)
 	{
 		$data = self::getAttachmentData($return);
-		if (!$data) {
+		if (empty($data) || empty($data["url"])) {
 			return $return;
 		}
 
@@ -549,7 +549,7 @@ class BBCode extends BaseObject
 			$data["title"] = str_replace(["http://", "https://"], "", $data["title"]);
 		}
 
-		if (((strpos($data["text"], "[img=") !== false) || (strpos($data["text"], "[img]") !== false) || Config::get('system', 'always_show_preview')) && ($data["image"] != "")) {
+		if (((strpos($data["text"], "[img=") !== false) || (strpos($data["text"], "[img]") !== false) || Config::get('system', 'always_show_preview')) && !empty($data["image"])) {
 			$data["preview"] = $data["image"];
 			$data["image"] = "";
 		}
@@ -567,6 +567,8 @@ class BBCode extends BaseObject
 					throw new Exception('OEmbed is disabled for this attachment.');
 				}
 			} catch (Exception $e) {
+				$data["title"] = defaults($data, 'title', $data['url']);
+
 				if ($simplehtml != 4) {
 					$return = sprintf('<div class="type-%s">', $data["type"]);
 				}
diff --git a/src/Content/Widget.php b/src/Content/Widget.php
index 04dfbb8e0..ba5752012 100644
--- a/src/Content/Widget.php
+++ b/src/Content/Widget.php
@@ -264,7 +264,7 @@ class Widget
 
 		$cid = $zcid = 0;
 
-		if (is_array($_SESSION['remote'])) {
+		if (!empty($_SESSION['remote'])) {
 			foreach ($_SESSION['remote'] as $visitor) {
 				if ($visitor['uid'] == $profile_uid) {
 					$cid = $visitor['cid'];
diff --git a/src/Database/DBStructure.php b/src/Database/DBStructure.php
index 7f758c54d..54e896b69 100644
--- a/src/Database/DBStructure.php
+++ b/src/Database/DBStructure.php
@@ -409,7 +409,7 @@ class DBStructure
 				// Compare the field structure field by field
 				foreach ($structure["fields"] AS $fieldname => $parameters) {
 					// Compare the field definition
-					$field_definition = $database[$name]["fields"][$fieldname];
+					$field_definition = defaults($database[$name]["fields"], $fieldname, ['Collation' => '']);
 
 					// Define the default collation if not given
 					if (!isset($parameters['Collation']) && !empty($field_definition['Collation'])) {
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 1c6225a30..dcd6c37db 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -475,34 +475,34 @@ class Contact extends BaseObject
 			$profile = $default;
 		}
 
-		if (($profile["photo"] == "") && isset($default["photo"])) {
+		if (empty($profile["photo"]) && isset($default["photo"])) {
 			$profile["photo"] = $default["photo"];
 		}
 
-		if (($profile["name"] == "") && isset($default["name"])) {
+		if (empty($profile["name"]) && isset($default["name"])) {
 			$profile["name"] = $default["name"];
 		}
 
-		if (($profile["network"] == "") && isset($default["network"])) {
+		if (empty($profile["network"]) && isset($default["network"])) {
 			$profile["network"] = $default["network"];
 		}
 
-		if (($profile["thumb"] == "") && isset($profile["photo"])) {
+		if (empty($profile["thumb"]) && isset($profile["photo"])) {
 			$profile["thumb"] = $profile["photo"];
 		}
 
-		if (($profile["micro"] == "") && isset($profile["thumb"])) {
+		if (empty($profile["micro"]) && isset($profile["thumb"])) {
 			$profile["micro"] = $profile["thumb"];
 		}
 
-		if ((($profile["addr"] == "") || ($profile["name"] == "")) && ($profile["gid"] != 0)
+		if ((empty($profile["addr"]) || empty($profile["name"])) && (defaults($profile, "gid", 0) != 0)
 			&& in_array($profile["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])
 		) {
 			Worker::add(PRIORITY_LOW, "UpdateGContact", $profile["gid"]);
 		}
 
 		// Show contact details of Diaspora contacts only if connected
-		if (($profile["cid"] == 0) && ($profile["network"] == NETWORK_DIASPORA)) {
+		if ((defaults($profile, "cid", 0) == 0) && (defaults($profile, "network", "") == NETWORK_DIASPORA)) {
 			$profile["location"] = "";
 			$profile["about"] = "";
 			$profile["gender"] = "";
@@ -596,7 +596,7 @@ class Contact extends BaseObject
 			$uid = local_user();
 		}
 
-		if ($contact['uid'] != $uid) {
+		if (empty($contact['uid']) || ($contact['uid'] != $uid)) {
 			if ($uid == 0) {
 				$profile_link = self::magicLink($contact['url']);
 				$menu = ['profile' => [L10n::t('View Profile'), $profile_link, true]];
@@ -1533,8 +1533,12 @@ class Contact extends BaseObject
 
 			$contact_record = [
 				'id' => dba::lastInsertId(),
-				'network' => NETWORK_OSTATUS
+				'network' => NETWORK_OSTATUS,
+				'name' => $name,
+				'url' => $url,
+				'photo' => $photo
 			];
+
 			Contact::updateAvatar($photo, $importer["uid"], $contact_record["id"], true);
 
 			/// @TODO Encapsulate this into a function/method
diff --git a/src/Model/GContact.php b/src/Model/GContact.php
index 488435331..99660ba60 100644
--- a/src/Model/GContact.php
+++ b/src/Model/GContact.php
@@ -787,11 +787,11 @@ class GContact
 
 		// Bugfix: We had an error in the storing of keywords which lead to the "0"
 		// This value is still transmitted via poco.
-		if ($contact["keywords"] == "0") {
+		if (!empty($contact["keywords"]) && ($contact["keywords"] == "0")) {
 			unset($contact["keywords"]);
 		}
 
-		if ($public_contact[0]["keywords"] == "0") {
+		if (!empty($public_contact[0]["keywords"]) && ($public_contact[0]["keywords"] == "0")) {
 			$public_contact[0]["keywords"] = "";
 		}
 
@@ -996,7 +996,7 @@ class GContact
 
 		$statistics = json_decode($result["body"]);
 
-		if (is_object($statistics->config)) {
+		if (!empty($statistics->config)) {
 			if ($statistics->config->instance_with_ssl) {
 				$server = "https://";
 			} else {
@@ -1006,8 +1006,7 @@ class GContact
 			$server .= $statistics->config->instance_address;
 
 			$hostname = $statistics->config->instance_address;
-		} else {
-			/// @TODO is_object() above means here no object, still $statistics is being used as object
+		} elseif (!empty($statistics)) {
 			if ($statistics->instance_with_ssl) {
 				$server = "https://";
 			} else {
@@ -1019,7 +1018,7 @@ class GContact
 			$hostname = $statistics->instance_address;
 		}
 
-		if (is_object($statistics->users)) {
+		if (!empty($statistics->users)) {
 			foreach ($statistics->users as $nick => $user) {
 				$profile_url = $server."/".$user->nickname;
 
@@ -1027,9 +1026,13 @@ class GContact
 						"name" => $user->fullname,
 						"addr" => $user->nickname."@".$hostname,
 						"nick" => $user->nickname,
-						"about" => $user->bio,
 						"network" => NETWORK_OSTATUS,
 						"photo" => System::baseUrl()."/images/person-175.jpg"];
+
+				if (isset($user->bio)) {
+					$contact["about"] = $user->bio;
+				}
+
 				self::getId($contact);
 			}
 		}
diff --git a/src/Model/Item.php b/src/Model/Item.php
index c07733172..670d5b426 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -726,21 +726,21 @@ class Item extends BaseObject
 
 		$author_owner_fields = ['author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link'];
 		foreach ($author_owner_fields as $field) {
-			if (isset($fields[$field])) {
+			if (array_key_exists($field, $fields)) {
 				$fields[$field] = null;
 			}
 		}
 
 		if (array_key_exists('tag', $fields)) {
 			$tags = $fields['tag'];
-			unset($fields['tag']);
+			$fields['tag'] = null;
 		} else {
 			$tags = '';
 		}
 
 		if (array_key_exists('file', $fields)) {
 			$files = $fields['file'];
-			unset($fields['file']);
+			$fields['file'] = null;
 		} else {
 			$files = '';
 		}
@@ -1329,12 +1329,7 @@ class Item extends BaseObject
 		if ($item['network'] == NETWORK_PHANTOM) {
 			logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
 
-			$contact = Contact::getDetailsByURL($item['author-link'], $item['uid']);
-			if (!empty($contact['network'])) {
-				$item['network'] = $contact["network"];
-			} else {
-				$item['network'] = NETWORK_DFRN;
-			}
+			$item['network'] = NETWORK_DFRN;
 			logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
 		}
 
@@ -1505,7 +1500,11 @@ class Item extends BaseObject
 		put_item_in_cache($item);
 
 		if ($notify) {
+			$item['edit'] = false;
+			$item['parent'] = $parent_id;
 			Addon::callHooks('post_local', $item);
+			unset($item['edit']);
+			unset($item['parent']);
 		} else {
 			Addon::callHooks('post_remote', $item);
 		}
@@ -1896,6 +1895,8 @@ class Item extends BaseObject
 			return;
 		}
 
+		$origin = $item['origin'];
+
 		unset($item['id']);
 		unset($item['parent']);
 		unset($item['mention']);
@@ -1918,7 +1919,7 @@ class Item extends BaseObject
 			$parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
 			while ($parent = dba::fetch($parents)) {
 				$users[$parent['uid']] = $parent['uid'];
-				if ($parent['origin'] && !$item['origin']) {
+				if ($parent['origin'] && !$origin) {
 					$origin_uid = $parent['uid'];
 				}
 			}
@@ -2449,7 +2450,7 @@ class Item extends BaseObject
 		}
 
 		// Prevent the forwarding of posts that are forwarded
-		if ($datarray["extid"] == NETWORK_DFRN) {
+		if (!empty($datarray["extid"]) && ($datarray["extid"] == NETWORK_DFRN)) {
 			logger('Already forwarded', LOGGER_DEBUG);
 			return false;
 		}
@@ -2940,6 +2941,7 @@ class Item extends BaseObject
 			'type'          => 'activity',
 			'wall'          => $item['wall'],
 			'origin'        => 1,
+			'network'       => NETWORK_DFRN,
 			'gravity'       => GRAVITY_ACTIVITY,
 			'parent'        => $item['id'],
 			'parent-uri'    => $item['uri'],
diff --git a/src/Model/Profile.php b/src/Model/Profile.php
index c006f1840..866065ec7 100644
--- a/src/Model/Profile.php
+++ b/src/Model/Profile.php
@@ -40,11 +40,11 @@ class Profile
 	{
 		$location = '';
 
-		if ($profile['locality']) {
+		if (!empty($profile['locality'])) {
 			$location .= $profile['locality'];
 		}
 
-		if ($profile['region'] && ($profile['locality'] != $profile['region'])) {
+		if (!empty($profile['region']) && (defaults($profile, 'locality', '') != $profile['region'])) {
 			if ($location) {
 				$location .= ', ';
 			}
@@ -52,7 +52,7 @@ class Profile
 			$location .= $profile['region'];
 		}
 
-		if ($profile['country-name']) {
+		if (!empty($profile['country-name'])) {
 			if ($location) {
 				$location .= ', ';
 			}
@@ -307,6 +307,8 @@ class Profile
 			$connect = false;
 		}
 
+		$profile_url = '';
+
 		// Is the local user already connected to that user?
 		if ($connect && local_user()) {
 			if (isset($profile['url'])) {
@@ -437,9 +439,9 @@ class Profile
 				'fullname' => $profile['name'],
 				'firstname' => $firstname,
 				'lastname' => $lastname,
-				'photo300' => $profile['contact_photo'],
-				'photo100' => $profile['contact_thumb'],
-				'photo50' => $profile['contact_micro'],
+				'photo300' => defaults($profile, 'contact_photo', ''),
+				'photo100' => defaults($profile, 'contact_thumb', ''),
+				'photo50' => defaults($profile, 'contact_micro', ''),
 			];
 		} else {
 			$diaspora = false;
@@ -497,7 +499,7 @@ class Profile
 			$p['photo'] = proxy_url($p['photo'], false, PROXY_SIZE_SMALL);
 		}
 
-		$p['url'] = Contact::magicLink($p['url']);
+		$p['url'] = Contact::magicLink(defaults($p, 'url', $profile_url));
 
 		$tpl = get_markup_template('profile_vcard.tpl');
 		$o .= replace_macros($tpl, [
diff --git a/src/Module/Login.php b/src/Module/Login.php
index 7d6470620..4df03f26d 100644
--- a/src/Module/Login.php
+++ b/src/Module/Login.php
@@ -248,7 +248,7 @@ class Login extends BaseModule
 				// Make sure to refresh the last login time for the user if the user
 				// stays logged in for a long time, e.g. with "Remember Me"
 				$login_refresh = false;
-				if (!x($_SESSION['last_login_date'])) {
+				if (empty($_SESSION['last_login_date'])) {
 					$_SESSION['last_login_date'] = DateTimeFormat::utcNow();
 				}
 				if (strcmp(DateTimeFormat::utc('now - 12 hours'), $_SESSION['last_login_date']) > 0) {
diff --git a/src/Module/Magic.php b/src/Module/Magic.php
index ce41f228d..0b6874069 100644
--- a/src/Module/Magic.php
+++ b/src/Module/Magic.php
@@ -13,7 +13,7 @@ use dba;
 
 /**
  * Magic Auth (remote authentication) module.
- * 
+ *
  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  */
 class Magic extends BaseModule
@@ -31,7 +31,7 @@ class Magic extends BaseModule
 		$test = ((x($_REQUEST, 'test')) ? intval($_REQUEST['test']) : 0);
 		$owa  = ((x($_REQUEST, 'owa'))  ? intval($_REQUEST['owa'])  : 0);
 
-		// NOTE: I guess $dest isn't just the profile url (could be also 
+		// NOTE: I guess $dest isn't just the profile url (could be also
 		// other profile pages e.g. photo). We need to find a solution
 		// to be able to redirct to other pages than the contact profile.
 		$cid = Contact::getIdForURL($dest);
@@ -48,8 +48,8 @@ class Magic extends BaseModule
 		$contact = dba::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
 
 		// Redirect if the contact is already authenticated on this site.
-		if (array_key_exists('id', $a->contact) && strpos($contact['nurl'], normalise_link(self::getApp()->get_baseurl())) !== false) {
-			if($test) {
+		if (!empty($a->contact) && array_key_exists('id', $a->contact) && strpos($contact['nurl'], normalise_link(self::getApp()->get_baseurl())) !== false) {
+			if ($test) {
 				$ret['success'] = true;
 				$ret['message'] .= 'Local site - you are already authenticated.' . EOL;
 				return $ret;
@@ -111,7 +111,7 @@ class Magic extends BaseModule
 			}
 		}
 
-		if($test) {
+		if ($test) {
 			$ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 			return $ret;
 		}
diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 8e44c8a50..d706089e8 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -697,6 +697,14 @@ class Probe
 			}
 		}
 
+		if (empty($result["network"])) {
+			$result["network"] = NETWORK_PHANTOM;
+		}
+
+		if (empty($result["url"])) {
+			$result["url"] = $uri;
+		}
+
 		logger($uri." is ".$result["network"], LOGGER_DEBUG);
 
 		if (empty($result["baseurl"])) {
@@ -980,7 +988,7 @@ class Probe
 			}
 		}
 
-		if (is_array($webfinger["aliases"])) {
+		if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 			foreach ($webfinger["aliases"] as $alias) {
 				if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
 					$data["alias"] = $alias;
@@ -990,7 +998,7 @@ class Probe
 			}
 		}
 
-		if (substr($webfinger["subject"], 0, 5) == "acct:") {
+		if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
 			$data["addr"] = substr($webfinger["subject"], 5);
 		}
 
@@ -1049,13 +1057,17 @@ class Probe
 			return false;
 		}
 
+		if (!isset($data["baseurl"])) {
+			$data["baseurl"] = "";
+		}
+
 		if ($vcards->length > 0) {
 			$vcard = $vcards->item(0);
 
 			// We have to discard the guid from the hcard in favour of the guid from lrdd
 			// Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
 			$search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
-			if (($search->length > 0) && ($data["guid"] == "")) {
+			if (($search->length > 0) && empty($data["guid"])) {
 				$data["guid"] = $search->item(0)->nodeValue;
 			}
 
@@ -1089,21 +1101,23 @@ class Probe
 		}
 
 		$avatar = [];
-		$photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
-		foreach ($photos as $photo) {
-			$attr = [];
-			foreach ($photo->attributes as $attribute) {
-				$attr[$attribute->name] = trim($attribute->value);
-			}
+		if (!empty($vcard)) {
+			$photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
+			foreach ($photos as $photo) {
+				$attr = [];
+				foreach ($photo->attributes as $attribute) {
+					$attr[$attribute->name] = trim($attribute->value);
+				}
 
-			if (isset($attr["src"]) && isset($attr["width"])) {
-				$avatar[$attr["width"]] = $attr["src"];
-			}
+				if (isset($attr["src"]) && isset($attr["width"])) {
+					$avatar[$attr["width"]] = $attr["src"];
+				}
 
-			// We don't have a width. So we just take everything that we got.
-			// This is a Hubzilla workaround which doesn't send a width.
-			if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
-				$avatar[] = $attr["src"];
+				// We don't have a width. So we just take everything that we got.
+				// This is a Hubzilla workaround which doesn't send a width.
+				if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
+					$avatar[] = $attr["src"];
+				}
 			}
 		}
 
@@ -1177,7 +1191,7 @@ class Probe
 			return false;
 		}
 
-		if (is_array($webfinger["aliases"])) {
+		if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 			foreach ($webfinger["aliases"] as $alias) {
 				if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
 					$data["alias"] = $alias;
@@ -1207,7 +1221,9 @@ class Probe
 			$data["network"] = NETWORK_DIASPORA;
 
 			// The Diaspora handle must always be lowercase
-			$data["addr"] = strtolower($data["addr"]);
+			if (!empty($data["addr"])) {
+				$data["addr"] = strtolower($data["addr"]);
+			}
 
 			// We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
 			$data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
@@ -1231,7 +1247,7 @@ class Probe
 	{
 		$data = [];
 
-		if (is_array($webfinger["aliases"])) {
+		if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 			foreach ($webfinger["aliases"] as $alias) {
 				if (strstr($alias, "@") && !strstr(normalise_link($alias), "http://")) {
 					$data["addr"] = str_replace('acct:', '', $alias);
@@ -1239,7 +1255,7 @@ class Probe
 			}
 		}
 
-		if (is_string($webfinger["subject"]) && strstr($webfinger["subject"], "@")
+		if (!empty($webfinger["subject"]) && strstr($webfinger["subject"], "@")
 			&& !strstr(normalise_link($webfinger["subject"]), "http://")
 		) {
 			$data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
@@ -1304,32 +1320,35 @@ class Probe
 			return false;
 		}
 		$feed = $ret['body'];
+		$dummy1 = null;
+		$dummy2 = null;
+		$dummy2 = null;
 		$feed_data = Feed::import($feed, $dummy1, $dummy2, $dummy3, true);
 		if (!$feed_data) {
 			return false;
 		}
 
-		if ($feed_data["header"]["author-name"] != "") {
+		if (!empty($feed_data["header"]["author-name"])) {
 			$data["name"] = $feed_data["header"]["author-name"];
 		}
-		if ($feed_data["header"]["author-nick"] != "") {
+		if (!empty($feed_data["header"]["author-nick"])) {
 			$data["nick"] = $feed_data["header"]["author-nick"];
 		}
-		if ($feed_data["header"]["author-avatar"] != "") {
+		if (!empty($feed_data["header"]["author-avatar"])) {
 			$data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
 		}
-		if ($feed_data["header"]["author-id"] != "") {
+		if (!empty($feed_data["header"]["author-id"])) {
 			$data["alias"] = $feed_data["header"]["author-id"];
 		}
-		if ($feed_data["header"]["author-location"] != "") {
+		if (!empty($feed_data["header"]["author-location"])) {
 			$data["location"] = $feed_data["header"]["author-location"];
 		}
-		if ($feed_data["header"]["author-about"] != "") {
+		if (!empty($feed_data["header"]["author-about"])) {
 			$data["about"] = $feed_data["header"]["author-about"];
 		}
 		// OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
 		// So we take the value that we just fetched, although the other one worked as well
-		if ($feed_data["header"]["author-link"] != "") {
+		if (!empty($feed_data["header"]["author-link"])) {
 			$data["url"] = $feed_data["header"]["author-link"];
 		}
 
@@ -1528,26 +1547,26 @@ class Probe
 			return self::feed($feed_url, false);
 		}
 
-		if ($feed_data["header"]["author-name"] != "") {
+		if (!empty($feed_data["header"]["author-name"])) {
 			$data["name"] = $feed_data["header"]["author-name"];
 		}
 
-		if ($feed_data["header"]["author-nick"] != "") {
+		if (!empty($feed_data["header"]["author-nick"])) {
 			$data["nick"] = $feed_data["header"]["author-nick"];
 		}
 
-		if ($feed_data["header"]["author-avatar"] != "") {
+		if (!empty($feed_data["header"]["author-avatar"])) {
 			$data["photo"] = $feed_data["header"]["author-avatar"];
 		}
 
-		if ($feed_data["header"]["author-id"] != "") {
+		if (!empty($feed_data["header"]["author-id"])) {
 			$data["alias"] = $feed_data["header"]["author-id"];
 		}
 
 		$data["url"] = $url;
 		$data["poll"] = $url;
 
-		if ($feed_data["header"]["author-link"] != "") {
+		if (!empty($feed_data["header"]["author-link"])) {
 			$data["baseurl"] = $feed_data["header"]["author-link"];
 		} else {
 			$data["baseurl"] = $data["url"];
diff --git a/src/Object/Image.php b/src/Object/Image.php
index 7e6b758f1..50e93672d 100644
--- a/src/Object/Image.php
+++ b/src/Object/Image.php
@@ -731,8 +731,11 @@ class Image
 			$headers=[];
 			$h = explode("\n", $a->get_curl_headers());
 			foreach ($h as $l) {
-				list($k,$v) = array_map("trim", explode(":", trim($l), 2));
-				$headers[$k] = $v;
+				$data = array_map("trim", explode(":", trim($l), 2));
+				if (count($data) > 1) {
+					list($k,$v) = $data;
+					$headers[$k] = $v;
+				}
 			}
 			if (array_key_exists('Content-Type', $headers))
 				$type = $headers['Content-Type'];
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index e37bfae56..60daa378c 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -77,6 +77,11 @@ class DFRN
 		}
 
 		foreach ($items as $item) {
+			// These values aren't sent when sending from the queue.
+			/// @todo Check if we can set these values from the queue or if they are needed at all.
+			$item["entry:comment-allow"] = defaults($item, "entry:comment-allow", true);
+			$item["entry:cid"] = defaults($item, "entry:cid", 0);
+
 			$entry = self::entry($doc, "text", $item, $owner, $item["entry:comment-allow"], $item["entry:cid"]);
 			$root->appendChild($entry);
 		}
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index ccd825d4e..d0fc182a2 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -3352,12 +3352,12 @@ class Diaspora
 
 		$guid = "";
 		preg_match("/guid='(.*?)'/ism", $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$guid = $matches[1];
 		}
 
 		preg_match('/guid="(.*?)"/ism', $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$guid = $matches[1];
 		}
 
@@ -3382,12 +3382,12 @@ class Diaspora
 
 		$profile = "";
 		preg_match("/profile='(.*?)'/ism", $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profile = $matches[1];
 		}
 
 		preg_match('/profile="(.*?)"/ism', $attributes, $matches);
-		if ($matches[1] != "") {
+		if (!empty($matches[1])) {
 			$profile = $matches[1];
 		}
 
diff --git a/src/Protocol/Feed.php b/src/Protocol/Feed.php
index 7be2ef8b4..a68a2bd67 100644
--- a/src/Protocol/Feed.php
+++ b/src/Protocol/Feed.php
@@ -45,7 +45,7 @@ class Feed {
 		} else {
 			logger("Test Atom/RSS feed", LOGGER_DEBUG);
 		}
-		if ($xml == "") {
+		if (empty($xml)) {
 			logger('XML is empty.', LOGGER_DEBUG);
 			return;
 		}
@@ -74,18 +74,18 @@ class Feed {
 
 		// Is it RDF?
 		if ($xpath->query('/rdf:RDF/rss:channel')->length > 0) {
-			$author["author-link"] = $xpath->evaluate('/rdf:RDF/rss:channel/rss:link/text()')->item(0)->nodeValue;
-			$author["author-name"] = $xpath->evaluate('/rdf:RDF/rss:channel/rss:title/text()')->item(0)->nodeValue;
+			$author["author-link"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:link/text()');
+			$author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:title/text()');
 
-			if ($author["author-name"] == "") {
-				$author["author-name"] = $xpath->evaluate('/rdf:RDF/rss:channel/rss:description/text()')->item(0)->nodeValue;
+			if (empty($author["author-name"])) {
+				$author["author-name"] = XML::getFirstNodeValue($xpath, '/rdf:RDF/rss:channel/rss:description/text()');
 			}
 			$entries = $xpath->query('/rdf:RDF/rss:item');
 		}
 
 		// Is it Atom?
 		if ($xpath->query('/atom:feed')->length > 0) {
-			$alternate = $xpath->query("atom:link[@rel='alternate']")->item(0)->attributes;
+			$alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']");
 			if (is_object($alternate)) {
 				foreach ($alternate AS $attribute) {
 					if ($attribute->name == "href") {
@@ -94,11 +94,8 @@ class Feed {
 				}
 			}
 
-			if ($author["author-link"] == "") {
-				$author["author-link"] = $author["author-id"];
-			}
-			if ($author["author-link"] == "") {
-				$self = $xpath->query("atom:link[@rel='self']")->item(0)->attributes;
+			if (empty($author["author-link"])) {
+				$self = XML::getFirstAttributes($xpath, "atom:link[@rel='self']");
 				if (is_object($self)) {
 					foreach ($self AS $attribute) {
 						if ($attribute->name == "href") {
@@ -108,27 +105,27 @@ class Feed {
 				}
 			}
 
-			if ($author["author-link"] == "") {
-				$author["author-link"] = $xpath->evaluate('/atom:feed/atom:id/text()')->item(0)->nodeValue;
+			if (empty($author["author-link"])) {
+				$author["author-link"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:id/text()');
 			}
-			$author["author-avatar"] = $xpath->evaluate('/atom:feed/atom:logo/text()')->item(0)->nodeValue;
+			$author["author-avatar"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:logo/text()');
 
-			$author["author-name"] = $xpath->evaluate('/atom:feed/atom:title/text()')->item(0)->nodeValue;
+			$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:title/text()');
 
-			if ($author["author-name"] == "") {
-				$author["author-name"] = $xpath->evaluate('/atom:feed/atom:subtitle/text()')->item(0)->nodeValue;
+			if (empty($author["author-name"])) {
+				$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:subtitle/text()');
 			}
-			if ($author["author-name"] == "") {
-				$author["author-name"] = $xpath->evaluate('/atom:feed/atom:author/atom:name/text()')->item(0)->nodeValue;
+			if (empty($author["author-name"])) {
+				$author["author-name"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:name/text()');
 			}
-			$value = $xpath->evaluate('atom:author/poco:displayName/text()')->item(0)->nodeValue;
+			$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:displayName/text()');
 			if ($value != "") {
 				$author["author-name"] = $value;
 			}
 			if ($simulate) {
-				$author["author-id"] = $xpath->evaluate('/atom:feed/atom:author/atom:uri/text()')->item(0)->nodeValue;
+				$author["author-id"] = XML::getFirstNodeValue($xpath, '/atom:feed/atom:author/atom:uri/text()');
 
-				$value = $xpath->evaluate('atom:author/poco:preferredUsername/text()')->item(0)->nodeValue;
+				$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()');
 				if ($value != "") {
 					$author["author-nick"] = $value;
 				}
@@ -140,7 +137,7 @@ class Feed {
 				if ($value != "") {
 					$author["author-about"] = $value;
 				}
-				$avatar = $xpath->evaluate("atom:author/atom:link[@rel='avatar']")->item(0)->attributes;
+				$avatar = XML::getFirstAttributes($xpath, "atom:author/atom:link[@rel='avatar']");
 				if (is_object($avatar)) {
 					foreach ($avatar AS $attribute) {
 						if ($attribute->name == "href") {
@@ -159,20 +156,20 @@ class Feed {
 
 		// Is it RSS?
 		if ($xpath->query('/rss/channel')->length > 0) {
-			$author["author-link"] = $xpath->evaluate('/rss/channel/link/text()')->item(0)->nodeValue;
+			$author["author-link"] = XML::getFirstNodeValue($xpath, '/rss/channel/link/text()');
 
-			$author["author-name"] = $xpath->evaluate('/rss/channel/title/text()')->item(0)->nodeValue;
-			$author["author-avatar"] = $xpath->evaluate('/rss/channel/image/url/text()')->item(0)->nodeValue;
+			$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/title/text()');
+			$author["author-avatar"] = XML::getFirstNodeValue($xpath, '/rss/channel/image/url/text()');
 
-			if ($author["author-name"] == "") {
-				$author["author-name"] = $xpath->evaluate('/rss/channel/copyright/text()')->item(0)->nodeValue;
+			if (empty($author["author-name"])) {
+				$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/copyright/text()');
 			}
-			if ($author["author-name"] == "") {
-				$author["author-name"] = $xpath->evaluate('/rss/channel/description/text()')->item(0)->nodeValue;
+			if (empty($author["author-name"])) {
+				$author["author-name"] = XML::getFirstNodeValue($xpath, '/rss/channel/description/text()');
 			}
-			$author["edited"] = $author["created"] = $xpath->query('/rss/channel/pubDate/text()')->item(0)->nodeValue;
+			$author["edited"] = $author["created"] = XML::getFirstNodeValue($xpath, '/rss/channel/pubDate/text()');
 
-			$author["app"] = $xpath->evaluate('/rss/channel/generator/text()')->item(0)->nodeValue;
+			$author["app"] = XML::getFirstNodeValue($xpath, '/rss/channel/generator/text()');
 
 			$entries = $xpath->query('/rss/channel/item');
 		}
@@ -180,7 +177,7 @@ class Feed {
 		if (!$simulate) {
 			$author["author-link"] = $contact["url"];
 
-			if ($author["author-name"] == "") {
+			if (empty($author["author-name"])) {
 				$author["author-name"] = $contact["name"];
 			}
 			$author["author-avatar"] = $contact["thumb"];
@@ -215,9 +212,9 @@ class Feed {
 
 			$item = array_merge($header, $author);
 
-			$alternate = $xpath->query("atom:link[@rel='alternate']", $entry)->item(0)->attributes;
+			$alternate = XML::getFirstAttributes($xpath, "atom:link[@rel='alternate']", $entry);
 			if (!is_object($alternate)) {
-				$alternate = $xpath->query("atom:link", $entry)->item(0)->attributes;
+				$alternate = XML::getFirstAttributes($xpath, "atom:link", $entry);
 			}
 			if (is_object($alternate)) {
 				foreach ($alternate AS $attribute) {
@@ -226,19 +223,19 @@ class Feed {
 					}
 				}
 			}
-			if ($item["plink"] == "") {
+			if (empty($item["plink"])) {
 				$item["plink"] = XML::getFirstNodeValue($xpath, 'link/text()', $entry);
 			}
-			if ($item["plink"] == "") {
+			if (empty($item["plink"])) {
 				$item["plink"] = XML::getFirstNodeValue($xpath, 'rss:link/text()', $entry);
 			}
 
 			$item["uri"] = XML::getFirstNodeValue($xpath, 'atom:id/text()', $entry);
 
-			if ($item["uri"] == "") {
+			if (empty($item["uri"])) {
 				$item["uri"] = XML::getFirstNodeValue($xpath, 'guid/text()', $entry);
 			}
-			if ($item["uri"] == "") {
+			if (empty($item["uri"])) {
 				$item["uri"] = $item["plink"];
 			}
 
@@ -260,23 +257,23 @@ class Feed {
 
 			$item["title"] = XML::getFirstNodeValue($xpath, 'atom:title/text()', $entry);
 
-			if ($item["title"] == "") {
+			if (empty($item["title"])) {
 				$item["title"] = XML::getFirstNodeValue($xpath, 'title/text()', $entry);
 			}
-			if ($item["title"] == "") {
+			if (empty($item["title"])) {
 				$item["title"] = XML::getFirstNodeValue($xpath, 'rss:title/text()', $entry);
 			}
 			$published = XML::getFirstNodeValue($xpath, 'atom:published/text()', $entry);
 
-			if ($published == "") {
+			if (empty($published)) {
 				$published = XML::getFirstNodeValue($xpath, 'pubDate/text()', $entry);
 			}
-			if ($published == "") {
+			if (empty($published)) {
 				$published = XML::getFirstNodeValue($xpath, 'dc:date/text()', $entry);
 			}
 			$updated = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $entry);
 
-			if ($updated == "") {
+			if (empty($updated)) {
 				$updated = $published;
 			}
 			if ($published != "") {
@@ -287,10 +284,10 @@ class Feed {
 			}
 			$creator = XML::getFirstNodeValue($xpath, 'author/text()', $entry);
 
-			if ($creator == "") {
+			if (empty($creator)) {
 				$creator = XML::getFirstNodeValue($xpath, 'atom:author/atom:name/text()', $entry);
 			}
-			if ($creator == "") {
+			if (empty($creator)) {
 				$creator = XML::getFirstNodeValue($xpath, 'dc:creator/text()', $entry);
 			}
 			if ($creator != "") {
@@ -324,8 +321,10 @@ class Feed {
 						$type = $attribute->textContent;
 					}
 				}
-				if (strlen($item["attach"])) {
+				if (!empty($item["attach"])) {
 					$item["attach"] .= ',';
+				} else {
+					$item["attach"] = '';
 				}
 
 				$attachments[] = ["link" => $href, "type" => $type, "length" => $length];
@@ -345,16 +344,16 @@ class Feed {
 				$tags .= $taglink;
 			}
 
-			$body = trim($xpath->evaluate('atom:content/text()', $entry)->item(0)->nodeValue);
+			$body = trim(XML::getFirstNodeValue($xpath, 'atom:content/text()', $entry));
 
-			if ($body == "") {
-				$body = trim($xpath->evaluate('content:encoded/text()', $entry)->item(0)->nodeValue);
+			if (empty($body)) {
+				$body = trim(XML::getFirstNodeValue($xpath, 'content:encoded/text()', $entry));
 			}
-			if ($body == "") {
-				$body = trim($xpath->evaluate('description/text()', $entry)->item(0)->nodeValue);
+			if (empty($body)) {
+				$body = trim(XML::getFirstNodeValue($xpath, 'description/text()', $entry));
 			}
-			if ($body == "") {
-				$body = trim($xpath->evaluate('atom:summary/text()', $entry)->item(0)->nodeValue);
+			if (empty($body)) {
+				$body = trim(XML::getFirstNodeValue($xpath, 'atom:summary/text()', $entry));
 			}
 
 			// remove the content of the title if it is identically to the body
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index 1c0cffb30..36f3faf2d 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -61,14 +61,16 @@ class OStatus
 
 		$aliaslink = $author["author-link"];
 
-		$alternate = $xpath->query("atom:author/atom:link[@rel='alternate']", $context)->item(0)->attributes;
-		if (is_object($alternate)) {
-			foreach ($alternate as $attributes) {
+		$alternate_item = $xpath->query("atom:author/atom:link[@rel='alternate']", $context)->item(0);
+		if (is_object($alternate_item)) {
+			foreach ($alternate_item->attributes as $attributes) {
 				if (($attributes->name == "href") && ($attributes->textContent != "")) {
 					$author["author-link"] = $attributes->textContent;
 				}
 			}
 		}
+		$author["author-id"] = Contact::getIdForURL($author["author-link"]);
+
 		$author["contact-id"] = $contact["id"];
 
 		$contact = null;
@@ -131,9 +133,7 @@ class OStatus
 			$author["author-name"] = $displayname;
 		}
 
-		$author["owner-name"] = $author["author-name"];
-		$author["owner-link"] = $author["author-link"];
-		$author["owner-avatar"] = $author["author-avatar"];
+		$author["owner-id"] = $author["author-id"];
 
 		// Only update the contacts if it is an OStatus contact
 		if (DBM::is_result($contact) && ($contact['id'] > 0) && !$onlyfetch && ($contact["network"] == NETWORK_OSTATUS)) {
@@ -206,12 +206,16 @@ class OStatus
 				dba::update('contact', $fields, ['id' => $cid], $old_contact);
 
 				// Update the avatar
-				Contact::updateAvatar($author["author-avatar"], 0, $cid);
+				if (!empty($author["author-avatar"])) {
+					Contact::updateAvatar($author["author-avatar"], 0, $cid);
+				}
 			}
 
 			$contact["generation"] = 2;
 			$contact["hide"] = false; // OStatus contacts are never hidden
-			$contact["photo"] = $author["author-avatar"];
+			if (!empty($author["author-avatar"])) {
+				$contact["photo"] = $author["author-avatar"];
+			}
 			$gcid = GContact::update($contact);
 
 			GContact::link($gcid, $contact["uid"], $contact["id"]);
@@ -325,12 +329,15 @@ class OStatus
 		$xpath->registerNamespace('statusnet', NAMESPACE_STATUSNET);
 
 		$hub = "";
-		$hub_attributes = $xpath->query("/atom:feed/atom:link[@rel='hub']")->item(0)->attributes;
-		if (is_object($hub_attributes)) {
-			foreach ($hub_attributes as $hub_attribute) {
-				if ($hub_attribute->name == "href") {
-					$hub = $hub_attribute->textContent;
-					logger("Found hub ".$hub, LOGGER_DEBUG);
+		$hub_items = $xpath->query("/atom:feed/atom:link[@rel='hub']")->item(0);
+		if (is_object($hub_items)) {
+			$hub_attributes = $hub_items->attributes;
+			if (is_object($hub_attributes)) {
+				foreach ($hub_attributes as $hub_attribute) {
+					if ($hub_attribute->name == "href") {
+						$hub = $hub_attribute->textContent;
+						logger("Found hub ".$hub, LOGGER_DEBUG);
+					}
 				}
 			}
 		}
@@ -390,7 +397,7 @@ class OStatus
 				$author = self::fetchAuthor($xpath, $entry, $importer, $contact, $stored);
 			}
 
-			$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()', $context);
+			$value = XML::getFirstNodeValue($xpath, 'atom:author/poco:preferredUsername/text()', $entry);
 			if ($value != "") {
 				$nickname = $value;
 			} else {
@@ -441,6 +448,7 @@ class OStatus
 			}
 
 			if ($item["verb"] == NAMESPACE_OSTATUS."/unfollow") {
+				$dummy = null;
 				Contact::removeFollower($importer, $contact, $item, $dummy);
 				continue;
 			}
@@ -611,9 +619,12 @@ class OStatus
 				foreach ($category->attributes as $attributes) {
 					if ($attributes->name == "term") {
 						$term = $attributes->textContent;
-						if (strlen($item["tag"])) {
+						if (!empty($item["tag"])) {
 							$item["tag"] .= ',';
+						} else {
+							$item["tag"] = '';
 						}
+
 						$item["tag"] .= "#[url=".System::baseUrl()."/search?tag=".$term."]".$term."[/url]";
 					}
 				}
@@ -1008,15 +1019,15 @@ class OStatus
 			$link_data = self::processLinks($links, $item);
 		}
 
-		$orig_body = $xpath->query('atom:content/text()', $activityobjects)->item(0)->nodeValue;
-		$orig_created = $xpath->query('atom:published/text()', $activityobjects)->item(0)->nodeValue;
-		$orig_edited = $xpath->query('atom:updated/text()', $activityobjects)->item(0)->nodeValue;
+		$orig_body = XML::getFirstNodeValue($xpath, 'atom:content/text()', $activityobjects);
+		$orig_created = XML::getFirstNodeValue($xpath, 'atom:published/text()', $activityobjects);
+		$orig_edited = XML::getFirstNodeValue($xpath, 'atom:updated/text()', $activityobjects);
 
 		$orig_author = self::fetchAuthor($xpath, $activityobjects, $importer, $dummy, false);
 
 		$item["author-name"] = $orig_author["author-name"];
 		$item["author-link"] = $orig_author["author-link"];
-		$item["author-avatar"] = $orig_author["author-avatar"];
+		$item["author-id"] = $orig_author["author-id"];
 
 		$item["body"] = HTML::toBBCode($orig_body);
 		$item["created"] = $orig_created;
@@ -1024,9 +1035,9 @@ class OStatus
 
 		$item["uri"] = $orig_uri;
 
-		$item["verb"] = $xpath->query('activity:verb/text()', $activityobjects)->item(0)->nodeValue;
+		$item["verb"] = XML::getFirstNodeValue($xpath, 'activity:verb/text()', $activityobjects);
 
-		$item["object-type"] = $xpath->query('activity:object-type/text()', $activityobjects)->item(0)->nodeValue;
+		$item["object-type"] = XML::getFirstNodeValue($xpath, 'activity:object-type/text()', $activityobjects);
 
 		$inreplyto = $xpath->query('thr:in-reply-to', $activityobjects);
 		if (is_object($inreplyto->item(0))) {
@@ -1055,7 +1066,7 @@ class OStatus
 		foreach ($links as $link) {
 			$attribute = self::readAttributes($link);
 
-			if (($attribute['rel'] != "") && ($attribute['href'] != "")) {
+			if (!empty($attribute['rel']) && !empty($attribute['href'])) {
 				switch ($attribute['rel']) {
 					case "alternate":
 						$item["plink"] = $attribute['href'];
@@ -1077,13 +1088,15 @@ class OStatus
 						if ($filetype == 'image') {
 							$link_data['add_body'] .= "\n[img]".$attribute['href'].'[/img]';
 						} else {
-							if (strlen($item["attach"])) {
+							if (!empty($item["attach"])) {
 								$item["attach"] .= ',';
+							} else {
+								$item["attach"] = '';
 							}
 							if (!isset($attribute['length'])) {
 								$attribute['length'] = "0";
 							}
-							$item["attach"] .= '[attach]href="'.$attribute['href'].'" length="'.$attribute['length'].'" type="'.$attribute['type'].'" title="'.$attribute['title'].'"[/attach]';
+							$item["attach"] .= '[attach]href="'.$attribute['href'].'" length="'.$attribute['length'].'" type="'.$attribute['type'].'" title="'.defaults($attribute, 'title', '').'"[/attach]';
 						}
 						break;
 					case "related":
@@ -1097,7 +1110,7 @@ class OStatus
 						}
 						break;
 					case "self":
-						if ($item["plink"] == '') {
+						if (empty($item["plink"])) {
 							$item["plink"] = $attribute['href'];
 						}
 						$link_data['self'] = $attribute['href'];
@@ -1627,6 +1640,7 @@ class OStatus
 		}
 
 		$contact = self::contactEntry($repeated_item['author-link'], $owner);
+		$contact['account-type'] = $contact['contact-type'];
 
 		$title = $owner["nick"]." repeated a notice by ".$contact["nick"];
 
@@ -1972,10 +1986,10 @@ class OStatus
 			if (isset($parent_item)) {
 				$conversation = dba::selectFirst('conversation', ['conversation-uri', 'conversation-href'], ['item-uri' => $parent_item]);
 				if (DBM::is_result($conversation)) {
-					if ($r['conversation-uri'] != '') {
+					if ($conversation['conversation-uri'] != '') {
 						$conversation_uri = $conversation['conversation-uri'];
 					}
-					if ($r['conversation-href'] != '') {
+					if ($conversation['conversation-href'] != '') {
 						$conversation_href = $conversation['conversation-href'];
 					}
 				}
diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index 719148a8e..580f45858 100644
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -120,7 +120,9 @@ class PortableContact
 			$contact_type = -1;
 			$generation = 0;
 
-			$name = $entry->displayName;
+			if (!empty($entry->displayName)) {
+				$name = $entry->displayName;
+			}
 
 			if (isset($entry->urls)) {
 				foreach ($entry->urls as $url) {
@@ -419,7 +421,7 @@ class PortableContact
 
 						GContact::update($contact);
 
-						if (trim($noscrape["updated"]) != "") {
+						if (!empty($noscrape["updated"])) {
 							$fields = ['last_contact' => DateTimeFormat::utcNow()];
 							dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 
@@ -1027,7 +1029,7 @@ class PortableContact
 
 		if (!$serverret["success"] || ($serverret["body"] == "") || empty($xmlobj) || !is_object($xmlobj)) {
 			// Workaround for bad configured servers (known nginx problem)
-			if (!in_array($serverret["debug"]["http_code"], ["403", "404"])) {
+			if (!empty($serverret["debug"]) && !in_array($serverret["debug"]["http_code"], ["403", "404"])) {
 				$failure = true;
 			}
 			$possible_failure = true;
@@ -1174,17 +1176,19 @@ class PortableContact
 				if (!empty($data->channels_total)) {
 					$registered_users = $data->channels_total;
 				}
-				switch ($data->register_policy) {
-					case "REGISTER_OPEN":
-						$register_policy = REGISTER_OPEN;
-						break;
-					case "REGISTER_APPROVE":
-						$register_policy = REGISTER_APPROVE;
-						break;
-					case "REGISTER_CLOSED":
-					default:
-						$register_policy = REGISTER_CLOSED;
-						break;
+				if (!empty($data->register_policy)) {
+					switch ($data->register_policy) {
+						case "REGISTER_OPEN":
+							$register_policy = REGISTER_OPEN;
+							break;
+						case "REGISTER_APPROVE":
+							$register_policy = REGISTER_APPROVE;
+							break;
+						case "REGISTER_CLOSED":
+						default:
+							$register_policy = REGISTER_CLOSED;
+							break;
+					}
 				}
 			} else {
 				// Test for Hubzilla, Redmatrix or Friendica
@@ -1266,7 +1270,7 @@ class PortableContact
 					$network = NETWORK_DIASPORA;
 				}
 
-				if ($data->registrations_open) {
+				if (!empty($data->registrations_open) && $data->registrations_open) {
 					$register_policy = REGISTER_OPEN;
 				} else {
 					$register_policy = REGISTER_CLOSED;
@@ -1317,7 +1321,9 @@ class PortableContact
 				if (isset($data->version)) {
 					$network = NETWORK_DFRN;
 
-					$noscrape = defaults($data->no_scrape_url, '');
+					if (!empty($data->no_scrape_url)) {
+						$noscrape = $data->no_scrape_url;
+					}
 					$version = $data->version;
 					$site_name = $data->site_name;
 					$info = $data->info;
@@ -1515,7 +1521,7 @@ class PortableContact
 		if ($serverdata) {
 			$servers = json_decode($serverdata);
 
-			if (is_array($servers->pods)) {
+			if (!empty($servers->pods)) {
 				foreach ($servers->pods as $server) {
 					Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://".$server->host);
 				}
diff --git a/src/Util/Network.php b/src/Util/Network.php
index 393b993e3..49c137e6c 100644
--- a/src/Util/Network.php
+++ b/src/Util/Network.php
@@ -101,7 +101,7 @@ class Network
 		$a = get_app();
 
 		$parts = parse_url($url);
-		$path_parts = explode('/', $parts['path']);
+		$path_parts = explode('/', defaults($parts, 'path', ''));
 		foreach ($path_parts as $part) {
 		        if (strlen($part) <> mb_strlen($part)) {
 				$parts2[] = rawurlencode($part);
@@ -250,7 +250,7 @@ class Network
 
 			$newurl = $curl_info['redirect_url'];
 
-			if (($new_location_info['path'] == '') && ($new_location_info['host'] != '')) {
+			if (empty($new_location_info['path']) && !empty($new_location_info['host'])) {
 				$newurl = $new_location_info['scheme'] . '://' . $new_location_info['host'] . $old_location_info['path'];
 			}
 
@@ -890,8 +890,8 @@ class Network
 		$i = 0;
 		$path = "";
 		do {
-			$path1 = $pathparts1[$i];
-			$path2 = $pathparts2[$i];
+			$path1 = defaults($pathparts1, $i, '');
+			$path2 = defaults($pathparts2, $i, '');
 
 			if ($path1 == $path2) {
 				$path .= $path1."/";
diff --git a/src/Util/ParseUrl.php b/src/Util/ParseUrl.php
index b267c6108..8fff3bcd8 100644
--- a/src/Util/ParseUrl.php
+++ b/src/Util/ParseUrl.php
@@ -159,19 +159,21 @@ class ParseUrl
 		if ($do_oembed) {
 			$oembed_data = OEmbed::fetchURL($url);
 
-			if (!in_array($oembed_data->type, ["error", "rich", ""])) {
-				$siteinfo["type"] = $oembed_data->type;
-			}
+			if (!empty($oembed_data->type)) {
+				if (!in_array($oembed_data->type, ["error", "rich", ""])) {
+					$siteinfo["type"] = $oembed_data->type;
+				}
 
-			if (($oembed_data->type == "link") && ($siteinfo["type"] != "photo")) {
-				if (isset($oembed_data->title)) {
-					$siteinfo["title"] = trim($oembed_data->title);
-				}
-				if (isset($oembed_data->description)) {
-					$siteinfo["text"] = trim($oembed_data->description);
-				}
-				if (isset($oembed_data->thumbnail_url)) {
-					$siteinfo["image"] = $oembed_data->thumbnail_url;
+				if (($oembed_data->type == "link") && ($siteinfo["type"] != "photo")) {
+					if (isset($oembed_data->title)) {
+						$siteinfo["title"] = trim($oembed_data->title);
+					}
+					if (isset($oembed_data->description)) {
+						$siteinfo["text"] = trim($oembed_data->description);
+					}
+					if (isset($oembed_data->thumbnail_url)) {
+						$siteinfo["image"] = $oembed_data->thumbnail_url;
+					}
 				}
 			}
 		}
@@ -251,9 +253,9 @@ class ParseUrl
 				}
 			}
 
-			$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
+			if (!empty($attr["content"])) {
+				$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
 
-			if ($attr["content"] != "") {
 				switch (strtolower($attr["name"])) {
 					case "fulltitle":
 						$siteinfo["title"] = trim($attr["content"]);
@@ -319,9 +321,9 @@ class ParseUrl
 				}
 			}
 
-			$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
+			if (!empty($attr["content"])) {
+				$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
 
-			if ($attr["content"] != "") {
 				switch (strtolower($attr["property"])) {
 					case "og:image":
 						$siteinfo["image"] = $attr["content"];
@@ -363,7 +365,7 @@ class ParseUrl
 									"height" => $photodata[1]];
 				}
 			}
-		} elseif ($siteinfo["image"] != "") {
+		} elseif (!empty($siteinfo["image"])) {
 			$src = self::completeUrl($siteinfo["image"], $url);
 
 			unset($siteinfo["image"]);
diff --git a/src/Util/XML.php b/src/Util/XML.php
index 03e17a554..e06a92d25 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -446,4 +446,19 @@ class XML
 
 		return $first_item->nodeValue;
 	}
+
+	public static function getFirstAttributes($xpath, $element, $context = null)
+	{
+		$result = $xpath->query($element, $context);
+		if (!is_object($result)) {
+			return false;
+		}
+
+		$first_item = $result->item(0);
+		if (!is_object($first_item)) {
+			return false;
+		}
+
+		return $first_item->attributes;
+	}
 }
diff --git a/src/Worker/Delivery.php b/src/Worker/Delivery.php
index 4e76c68f7..8b5b96d5b 100644
--- a/src/Worker/Delivery.php
+++ b/src/Worker/Delivery.php
@@ -61,7 +61,7 @@ class Delivery extends BaseObject
 
 			$condition = ['id' => [$item_id, $parent_id], 'visible' => true, 'moderated' => false];
 			$params = ['order' => ['id']];
-			$itemdata = Item::select(Item::ITEM_FIELDLIST, $condition, $params);
+			$itemdata = Item::select([], $condition, $params);
 
 			$items = [];
 			while ($item = Item::fetch($itemdata)) {
diff --git a/src/Worker/Queue.php b/src/Worker/Queue.php
index 89ec28262..c8ba5795a 100644
--- a/src/Worker/Queue.php
+++ b/src/Worker/Queue.php
@@ -11,6 +11,7 @@ use Friendica\Core\Worker;
 use Friendica\Database\DBM;
 use Friendica\Model\Queue as QueueModel;
 use Friendica\Model\PushSubscriber;
+use Friendica\Model\User;
 use Friendica\Protocol\DFRN;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\PortableContact;
@@ -106,7 +107,7 @@ class Queue
 
 		$data   = $q_item['content'];
 		$public = $q_item['batch'];
-		$owner  = $user;
+		$owner  = User::getOwnerDataById($user['uid']);
 
 		$deliver_status = 0;
 
diff --git a/view/theme/frio/php/default.php b/view/theme/frio/php/default.php
index 428d88788..99baa8efc 100644
--- a/view/theme/frio/php/default.php
+++ b/view/theme/frio/php/default.php
@@ -21,8 +21,8 @@ if (!isset($minimal)) {
 ?>
 <html>
 	<head>
-		<title><?php if (x($page, 'title')) echo $page['title'] ?></title>
-		<meta request="<?php echo htmlspecialchars($_REQUEST['pagename']) ?>">
+		<title><?php if (!empty($page['title'])) echo $page['title'] ?></title>
+		<meta request="<?php echo htmlspecialchars(defaults($_REQUEST, 'pagename', '')) ?>">
 		<script  type="text/javascript">var baseurl = "<?php echo System::baseUrl(); ?>";</script>
 		<script type="text/javascript">var frio = "<?php echo 'view/theme/frio'; ?>";</script>
 <?php
diff --git a/view/theme/vier/theme.php b/view/theme/vier/theme.php
index b99433f81..58f099b83 100644
--- a/view/theme/vier/theme.php
+++ b/view/theme/vier/theme.php
@@ -29,8 +29,8 @@ function vier_init(App $a)
 
 	$a->set_template_engine('smarty3');
 
-	if (!empty($a->argv[0]) && !empty($a->argv[1])) {
-		if ($a->argv[0].$a->argv[1] === "profile".$a->user['nickname'] || $a->argv[0] === "network" && local_user()) {
+	if (!empty($a->argv[0])) {
+		if ($a->argv[0] . defaults($a->argv, 1, '') === "profile".$a->user['nickname'] || $a->argv[0] === "network" && local_user()) {
 			vier_community_info();
 
 			$a->page['htmlhead'] .= "<link rel='stylesheet' type='text/css' href='view/theme/vier/wide.css' media='screen and (min-width: 1300px)'/>\n";