diff --git a/mod/dfrn_request.php b/mod/dfrn_request.php
index 34cc9cf25..e8bc50926 100644
--- a/mod/dfrn_request.php
+++ b/mod/dfrn_request.php
@@ -168,7 +168,7 @@ function dfrn_request_post(App $a)
 					$parms['key'] // this was already escaped
 				);
 				if (DBM::is_result($r)) {
-					Group::addMember(User::getDefaultGroup($uid, $r[0]["network"]), $r[0]['id']);
+					Group::addMember(User::getDefaultGroup(local_user(), $r[0]["network"]), $r[0]['id']);
 
 					if (isset($photo)) {
 						Contact::updateAvatar($photo, local_user(), $r[0]["id"], true);
diff --git a/mod/editpost.php b/mod/editpost.php
index af8f4e317..f28e7a50b 100644
--- a/mod/editpost.php
+++ b/mod/editpost.php
@@ -38,6 +38,8 @@ function editpost_content(App $a) {
 		return;
 	}
 
+	$geotag = '';
+
 	$o .= replace_macros(get_markup_template("section_title.tpl"),[
 		'$title' => L10n::t('Edit post')
 	]);
diff --git a/mod/install.php b/mod/install.php
index f3969a6f2..3adcb75aa 100644
--- a/mod/install.php
+++ b/mod/install.php
@@ -222,6 +222,7 @@ function install_content(App $a) {
 			$dbdata = notags(trim($_POST['dbdata']));
 			$phpath = notags(trim($_POST['phpath']));
 
+			$adminmail = notags(trim($_POST['adminmail']));
 
 			$tpl = get_markup_template('install_db.tpl');
 			$o .= replace_macros($tpl, [
diff --git a/mod/localtime.php b/mod/localtime.php
index b10f1571a..9a754ac80 100644
--- a/mod/localtime.php
+++ b/mod/localtime.php
@@ -30,7 +30,7 @@ function localtime_content(App $a)
 		$t = 'now';
 	}
 
-	$o .= '<h3>' . L10n::t('Time Conversion') . '</h3>';
+	$o  = '<h3>' . L10n::t('Time Conversion') . '</h3>';
 
 	$o .= '<p>' . L10n::t('Friendica provides this service for sharing events with other networks and friends in unknown timezones.') . '</p>';
 
diff --git a/mod/lostpass.php b/mod/lostpass.php
index 73167e6fe..56ad7e30e 100644
--- a/mod/lostpass.php
+++ b/mod/lostpass.php
@@ -125,6 +125,7 @@ function lostpass_form()
 function lostpass_generate_password($user)
 {
 	$o = '';
+	$a = get_app();
 
 	$new_password = User::generateNewPassword();
 	$result = User::updatePassword($user['uid'], $new_password);
diff --git a/mod/message.php b/mod/message.php
index f1e3b7645..8940ee44b 100644
--- a/mod/message.php
+++ b/mod/message.php
@@ -250,7 +250,6 @@ function message_content(App $a)
 			'$to' => L10n::t('To:'),
 			'$showinputs' => 'true',
 			'$prefill' => $prefill,
-			'$autocomp' => $autocomp,
 			'$preid' => $preid,
 			'$subject' => L10n::t('Subject:'),
 			'$subjtxt' => x($_REQUEST, 'subject') ? strip_tags($_REQUEST['subject']) : '',
diff --git a/mod/network.php b/mod/network.php
index 834eedf49..3013e9498 100644
--- a/mod/network.php
+++ b/mod/network.php
@@ -444,7 +444,7 @@ function networkFlatView(App $a, $update = 0)
 	}
 
 	if (strlen($file)) {
-		$sql_post_table .= sprintf("INNER JOIN (SELECT `oid` FROM `term` WHERE `term` = '%s' AND `otype` = %d AND `type` = %d AND `uid` = %d ORDER BY `tid` DESC) AS `term` ON `item`.`id` = `term`.`oid` ",
+		$sql_post_table = sprintf("INNER JOIN (SELECT `oid` FROM `term` WHERE `term` = '%s' AND `otype` = %d AND `type` = %d AND `uid` = %d ORDER BY `tid` DESC) AS `term` ON `item`.`id` = `term`.`oid` ",
 			dbesc(protect_sprintf($file)), intval(TERM_OBJ_POST), intval(TERM_FILE), intval(local_user()));
 	} else {
 		$sql_post_table = " INNER JOIN `thread` ON `thread`.`iid` = `item`.`parent`";
diff --git a/mod/notify.php b/mod/notify.php
index 0ab2b0d41..dff7d147f 100644
--- a/mod/notify.php
+++ b/mod/notify.php
@@ -77,7 +77,7 @@ function notify_content(App $a)
 		$notif_content .= L10n::t('No more system notifications.');
 	}
 
-	$o .= replace_macros($notif_tpl, [
+	$o = replace_macros($notif_tpl, [
 		'$notif_header' => L10n::t('System Notifications'),
 		'$tabs' => false, // $tabs,
 		'$notif_content' => $notif_content,
diff --git a/mod/photos.php b/mod/photos.php
index 9515d1795..4b031e5b5 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -865,7 +865,7 @@ function photos_post(App $a)
 
 	// Create item container
 	$lat = $lon = null;
-	if ($exif && $exif['GPS'] && Feature::isEnabled($channel_id, 'photo_location')) {
+	if ($exif && $exif['GPS'] && Feature::isEnabled($page_owner_uid, 'photo_location')) {
 		$lat = Photo::getGps($exif['GPS']['GPSLatitude'], $exif['GPS']['GPSLatitudeRef']);
 		$lon = Photo::getGps($exif['GPS']['GPSLongitude'], $exif['GPS']['GPSLongitudeRef']);
 	}
diff --git a/mod/ping.php b/mod/ping.php
index 1bb8f147f..62ab2644c 100644
--- a/mod/ping.php
+++ b/mod/ping.php
@@ -571,8 +571,8 @@ function ping_format_xml_data($data, $sysnotify, $notifs, $sysmsgs, $sysmsgs_inf
 	$forums = [];
 	if (count($forums_unseen)) {
 		foreach ($forums_unseen as $key => $item) {
-			$forums[$count . ':forum'] = $item['count'];
-			$forums[$count . ':@attributes'] = ['id' => $item['id']];
+			$forums[$key . ':forum'] = $item['count'];
+			$forums[$key . ':@attributes'] = ['id' => $item['id']];
 		}
 		$data['forums'] = $forums;
 	}
diff --git a/mod/probe.php b/mod/probe.php
index b4f6ff3a4..5e7a5253f 100644
--- a/mod/probe.php
+++ b/mod/probe.php
@@ -15,7 +15,7 @@ function probe_content(App $a)
 		killme();
 	}
 
-	$o .= '<h3>Probe Diagnostic</h3>';
+	$o  = '<h3>Probe Diagnostic</h3>';
 
 	$o .= '<form action="probe" method="get">';
 	$o .= 'Lookup address: <input type="text" style="width: 250px;" name="addr" value="' . $_GET['addr'] . '" />';
diff --git a/mod/profile_photo.php b/mod/profile_photo.php
index 370e19ce5..5556553cf 100644
--- a/mod/profile_photo.php
+++ b/mod/profile_photo.php
@@ -257,7 +257,7 @@ function profile_photo_content(App $a) {
 
 		$tpl = get_markup_template('profile_photo.tpl');
 
-		$o .= replace_macros($tpl,[
+		$o = replace_macros($tpl,[
 			'$user' => $a->user['nickname'],
 			'$lbl_upfile' => L10n::t('Upload File:'),
 			'$lbl_profiles' => L10n::t('Select a profile:'),
@@ -272,9 +272,8 @@ function profile_photo_content(App $a) {
 	}
 	else {
 		$filename = $a->config['imagecrop'] . '-' . $a->config['imagecrop_resolution'] . '.'.$a->config['imagecrop_ext'];
-		$resolution = $a->config['imagecrop_resolution'];
 		$tpl = get_markup_template("cropbody.tpl");
-		$o .= replace_macros($tpl,[
+		$o = replace_macros($tpl,[
 			'$filename' => $filename,
 			'$profile' => intval($_REQUEST['profile']),
 			'$resource' => $a->config['imagecrop'] . '-' . $a->config['imagecrop_resolution'],
@@ -313,6 +312,7 @@ function profile_photo_crop_ui_head(App $a, Image $Image) {
 
 
 	$smallest = 0;
+	$filename = '';
 
 	$r = Photo::store($Image, local_user(), 0, $hash, $filename, L10n::t('Profile Photos'), 0);
 
diff --git a/mod/profperm.php b/mod/profperm.php
index 3486a1df5..0f864d42f 100644
--- a/mod/profperm.php
+++ b/mod/profperm.php
@@ -35,6 +35,8 @@ function profperm_content(App $a) {
 		return;
 	}
 
+	$o = '';
+
 	// Switch to text mod interface if we have more than 'n' contacts or group members
 
 	$switchtotext = PConfig::get(local_user(),'system','groupedit_image_limit');
@@ -165,4 +167,3 @@ function profperm_content(App $a) {
 	return $o;
 
 }
-
diff --git a/mod/register.php b/mod/register.php
index bf87c9259..4a59277b4 100644
--- a/mod/register.php
+++ b/mod/register.php
@@ -58,6 +58,7 @@ function register_post(App $a)
 			break;
 	}
 
+	$netpublish = (((x($_POST, 'profile_publish_reg')) &intval($_POST['profile_publish_reg']) = 1) ? 1 : 0);
 
 	$arr = $_POST;
 
diff --git a/mod/regmod.php b/mod/regmod.php
index 89e348d50..aa64986d0 100644
--- a/mod/regmod.php
+++ b/mod/regmod.php
@@ -55,7 +55,7 @@ function user_allow($hash)
 
 	L10n::pushLang($register[0]['language']);
 
-	User::sendRegisterOpenEmail(
+	$res = User::sendRegisterOpenEmail(
 		$user[0]['email'],
 		$a->config['sitename'],
 		System::baseUrl(),
@@ -100,7 +100,7 @@ function regmod_content(App $a)
 
 	if (!local_user()) {
 		info(L10n::t('Please login.') . EOL);
-		$o .= '<br /><br />' . Login::form($a->query_string, $a->config['register_policy'] == REGISTER_CLOSED ? 0 : 1);
+		$o = '<br /><br />' . Login::form($a->query_string, $a->config['register_policy'] == REGISTER_CLOSED ? 0 : 1);
 		return $o;
 	}
 
diff --git a/mod/removeme.php b/mod/removeme.php
index 27d501d66..0363bf9f3 100644
--- a/mod/removeme.php
+++ b/mod/removeme.php
@@ -49,7 +49,7 @@ function removeme_content(App $a)
 	$_SESSION['remove_account_verify'] = $hash;
 
 	$tpl = get_markup_template('removeme.tpl');
-	$o .= replace_macros($tpl, [
+	$o = replace_macros($tpl, [
 		'$basedir' => System::baseUrl(),
 		'$hash' => $hash,
 		'$title' => L10n::t('Remove My Account'),
diff --git a/mod/search.php b/mod/search.php
index f1f10addb..afe94121d 100644
--- a/mod/search.php
+++ b/mod/search.php
@@ -19,6 +19,7 @@ require_once 'mod/dirfind.php';
 function search_saved_searches() {
 
 	$o = '';
+	$search = ((x($_GET,'search')) ? notags(trim(rawurldecode($_GET['search']))) : '');
 
 	if (! Feature::isEnabled(local_user(),'savedsearch'))
 		return $o;
@@ -150,7 +151,7 @@ function search_content(App $a) {
 	}
 
 	// contruct a wrapper for the search header
-	$o .= replace_macros(get_markup_template("content_wrapper.tpl"),[
+	$o = replace_macros(get_markup_template("content_wrapper.tpl"),[
 		'name' => "search-header",
 		'$title' => L10n::t("Search"),
 		'$title_size' => 3,
diff --git a/mod/tagger.php b/mod/tagger.php
index 6016d443b..0ee8d88b6 100644
--- a/mod/tagger.php
+++ b/mod/tagger.php
@@ -72,7 +72,7 @@ function tagger_content(App $a) {
 	$targettype = (($item['resource-id']) ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE );
 
 	$link = xmlify('<link rel="alternate" type="text/html" href="'
-		. System::baseUrl() . '/display/' . $owner['nickname'] . '/' . $item['id'] . '" />' . "\n") ;
+		. System::baseUrl() . '/display/' . $r['nickname'] . '/' . $item['id'] . '" />' . "\n") ;
 
 	$body = xmlify($item['body']);
 
diff --git a/mod/viewcontacts.php b/mod/viewcontacts.php
index b45980fec..20585676d 100644
--- a/mod/viewcontacts.php
+++ b/mod/viewcontacts.php
@@ -46,6 +46,8 @@ function viewcontacts_content(App $a)
 		return;
 	}
 
+	$is_owner = ((local_user() && ($a->profile['profile_uid'] == local_user())) ? true : false);
+
 	$o = "";
 
 	// tabs
@@ -97,9 +99,6 @@ function viewcontacts_content(App $a)
 		$url = $rr['url'];
 
 		// route DFRN profiles through the redirect
-
-		$is_owner = ((local_user() && ($a->profile['profile_uid'] == local_user())) ? true : false);
-
 		if ($is_owner && ($rr['network'] === NETWORK_DFRN) && ($rr['rel'])) {
 			$url = 'redir/' . $rr['id'];
 		} else {
diff --git a/mod/viewsrc.php b/mod/viewsrc.php
index 376e2ef68..d2f0d01a0 100644
--- a/mod/viewsrc.php
+++ b/mod/viewsrc.php
@@ -13,6 +13,7 @@ function viewsrc_content(App $a) {
 		return;
 	}
 
+	$o = ''; 
 	$item_id = (($a->argc > 1) ? intval($a->argv[1]) : 0);
 
 	if(! $item_id) {
diff --git a/mod/wallmessage.php b/mod/wallmessage.php
index 250b7d70d..75aca1f68 100644
--- a/mod/wallmessage.php
+++ b/mod/wallmessage.php
@@ -128,7 +128,7 @@ function wallmessage_content(App $a) {
 	]);
 
 	$tpl = get_markup_template('wallmessage.tpl');
-	$o .= replace_macros($tpl, [
+	$o = replace_macros($tpl, [
 		'$header' => L10n::t('Send Private Message'),
 		'$subheader' => L10n::t('If you wish for %s to respond, please check that the privacy settings on your site allow private mail from unknown senders.', $user['username']),
 		'$to' => L10n::t('To:'),
@@ -139,7 +139,6 @@ function wallmessage_content(App $a) {
 		'$text' => ((x($_REQUEST, 'body')) ? escape_tags(htmlspecialchars($_REQUEST['body'])) : ''),
 		'$readonly' => '',
 		'$yourmessage' => L10n::t('Your message:'),
-		'$select' => $select,
 		'$parent' => '',
 		'$upload' => L10n::t('Upload photo'),
 		'$insert' => L10n::t('Insert web link'),
diff --git a/mod/webfinger.php b/mod/webfinger.php
index c88679352..6f49a8f28 100644
--- a/mod/webfinger.php
+++ b/mod/webfinger.php
@@ -20,7 +20,7 @@ function webfinger_content(App $a)
 		killme();
 	}
 
-	$o .= '<h3>Webfinger Diagnostic</h3>';
+	$o  = '<h3>Webfinger Diagnostic</h3>';
 
 	$o .= '<form action="webfinger" method="get">';
 	$o .= 'Lookup address: <input type="text" style="width: 250px;" name="addr" value="' . $_GET['addr'] .'" />';