diff --git a/src/Content/OEmbed.php b/src/Content/OEmbed.php
index 144ac4ca53..0093ba11af 100644
--- a/src/Content/OEmbed.php
+++ b/src/Content/OEmbed.php
@@ -370,8 +370,6 @@ class OEmbed
 	 */
 	private static function iframe($src, $width, $height)
 	{
-		$a = \get_app();
-
 		if (!$height || strstr($height, '%')) {
 			$height = '200';
 		}
diff --git a/src/Content/Text/BBCode.php b/src/Content/Text/BBCode.php
index 357dc89d9a..78f252b924 100644
--- a/src/Content/Text/BBCode.php
+++ b/src/Content/Text/BBCode.php
@@ -1683,7 +1683,7 @@ class BBCode extends BaseObject
 
 		// Replace non graphical smilies for external posts
 		if ($simple_html) {
-			$text = Smilies::replace($text, false, true);
+			$text = Smilies::replace($text);
 		}
 
 		// Unhide all [noparse] contained bbtags unspacefying them
diff --git a/src/Core/Config/JITConfigAdapter.php b/src/Core/Config/JITConfigAdapter.php
index ed5f1a3f67..ce1c13b2ca 100644
--- a/src/Core/Config/JITConfigAdapter.php
+++ b/src/Core/Config/JITConfigAdapter.php
@@ -84,8 +84,6 @@ class JITConfigAdapter extends BaseObject implements IConfigAdapter
 
 	public function set($cat, $k, $value)
 	{
-		$a = self::getApp();
-
 		// We store our setting values in a string variable.
 		// So we have to do the conversion here so that the compare below works.
 		// The exception are array values.
diff --git a/src/Core/Console.php b/src/Core/Console.php
index 2cca4f15bb..32e12fa1f0 100644
--- a/src/Core/Console.php
+++ b/src/Core/Console.php
@@ -73,7 +73,6 @@ HELP;
 			$this->out('Options: ' . var_export($this->options, true));
 		}
 
-		$showHelp = false;
 		$subHelp = false;
 		$command = null;
 
@@ -83,7 +82,6 @@ HELP;
 			return 0;
 		} elseif ((count($this->options) === 0 || $this->getOption($this->customHelpOptions) === true || $this->getOption($this->customHelpOptions) === 1) && count($this->args) === 0
 		) {
-			$showHelp = true;
 		} elseif (count($this->args) >= 2 && $this->getArgument(0) == 'help') {
 			$command = $this->getArgument(1);
 			$subHelp = true;
diff --git a/src/Core/Console/PoToPhp.php b/src/Core/Console/PoToPhp.php
index c492f7424c..d539eae5b6 100644
--- a/src/Core/Console/PoToPhp.php
+++ b/src/Core/Console/PoToPhp.php
@@ -47,8 +47,6 @@ HELP;
 			throw new \Asika\SimpleConsole\CommandArgsException('Too many arguments');
 		}
 
-		$a = \get_app();
-
 		$pofile = realpath($this->getArgument(0));
 
 		if (!file_exists($pofile)) {
@@ -106,7 +104,6 @@ HELP;
 				}
 
 				if ($inv) {
-					$inv = false;
 					$out .= '"' . $v . '"';
 				}
 
@@ -179,7 +176,6 @@ HELP;
 		}
 
 		if ($inv) {
-			$inv = false;
 			$out .= '"' . $v . '"';
 		}
 
diff --git a/src/Core/Console/Storage.php b/src/Core/Console/Storage.php
index f9674c4d19..e0083598c3 100644
--- a/src/Core/Console/Storage.php
+++ b/src/Core/Console/Storage.php
@@ -37,8 +37,6 @@ HELP;
 
 	protected function doExecute()
 	{
-		$a = \Friendica\BaseObject::getApp();
-
 		if ($this->getOption('v')) {
 			$this->out('Executable: ' . $this->executable);
 			$this->out('Class: ' . __CLASS__);
diff --git a/src/Core/Installer.php b/src/Core/Installer.php
index cf5dd9ffc2..a487aec78b 100644
--- a/src/Core/Installer.php
+++ b/src/Core/Installer.php
@@ -224,8 +224,6 @@ class Installer
 	 */
 	public function checkPHP($phppath = null, $required = false)
 	{
-		$passed = false;
-		$passed2 = false;
 		$passed3 = false;
 
 		if (!isset($phppath)) {
@@ -394,7 +392,7 @@ class Installer
 		$help = '';
 		$status = true;
 		try {
-			$xml = new DOMDocument();
+			new DOMDocument();
 		} catch (Exception $e) {
 			$help = L10n::t('Error, XML PHP module required but not installed.');
 			$status = false;
diff --git a/src/Core/NotificationsManager.php b/src/Core/NotificationsManager.php
index 566b701748..98de4fa178 100644
--- a/src/Core/NotificationsManager.php
+++ b/src/Core/NotificationsManager.php
@@ -229,7 +229,6 @@ class NotificationsManager extends BaseObject
 	 */
 	private function formatNotifs(array $notifs, $ident = "")
 	{
-		$notif = [];
 		$arr = [];
 
 		if (DBA::isResult($notifs)) {
diff --git a/src/Core/PConfig.php b/src/Core/PConfig.php
index ebe693edf6..584318adbc 100644
--- a/src/Core/PConfig.php
+++ b/src/Core/PConfig.php
@@ -37,7 +37,7 @@ class PConfig extends BaseObject
 		if ($a->getConfigValue('system', 'config_adapter') == 'preload') {
 			self::$adapter = new Config\PreloadPConfigAdapter($uid);
 		} else {
-			self::$adapter = new Config\JITPConfigAdapter($uid);
+			self::$adapter = new Config\JITPConfigAdapter();
 		}
 	}
 
diff --git a/src/Core/System.php b/src/Core/System.php
index 81c537169e..ba3d03e622 100644
--- a/src/Core/System.php
+++ b/src/Core/System.php
@@ -59,7 +59,6 @@ class System extends BaseObject
 		array_shift($trace);
 
 		$callstack = [];
-		$counter = 0;
 		$previous = ['class' => '', 'function' => ''];
 
 		// The ignore list contains all functions that are only wrapper functions
diff --git a/src/Database/DBA.php b/src/Database/DBA.php
index 7838a99ef5..e14d94ce04 100644
--- a/src/Database/DBA.php
+++ b/src/Database/DBA.php
@@ -1105,7 +1105,7 @@ class DBA
 			if ((count($conditions) == 1) && ($field == array_keys($conditions)[0])) {
 				foreach ($rel_def AS $rel_table => $rel_fields) {
 					foreach ($rel_fields AS $rel_field) {
-						$retval = self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, $callstack);
+						self::delete($rel_table, [$rel_field => array_values($conditions)[0]], $options, $callstack);
 					}
 				}
 				// We quit when this key already exists in the callstack.
@@ -1579,8 +1579,6 @@ class DBA
 		$ret = self::p("SHOW PROCESSLIST");
 		$data = self::toArray($ret);
 
-		$s = [];
-
 		$processes = 0;
 		$states = [];
 		foreach ($data as $process) {
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 4a8a8cdaba..f3448569b6 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -885,8 +885,6 @@ class Contact extends BaseObject
 	 */
 	public static function getDetailsByAddr($addr, $uid = -1)
 	{
-		static $cache = [];
-
 		if ($addr == '') {
 			return [];
 		}
@@ -942,14 +940,9 @@ class Contact extends BaseObject
 	 */
 	public static function photoMenu(array $contact, $uid = 0)
 	{
-		// @todo Unused, to be removed
-		$a = \get_app();
-
-		$contact_url = '';
 		$pm_url = '';
 		$status_link = '';
 		$photos_link = '';
-		$posts_link = '';
 		$contact_drop_link = '';
 		$poke_link = '';
 
@@ -1219,7 +1212,6 @@ class Contact extends BaseObject
 			$contact_id = self::getIdForURL($data["alias"], $uid, true, $default, true);
 		}
 
-		$url = $data["url"];
 		if (!$contact_id) {
 			$fields = [
 				'uid'       => $uid,
diff --git a/src/Model/Event.php b/src/Model/Event.php
index 8b7c7e706c..576f47ba83 100644
--- a/src/Model/Event.php
+++ b/src/Model/Event.php
@@ -239,8 +239,6 @@ class Event extends BaseObject
 	 */
 	public static function store($arr)
 	{
-		$a = self::getApp();
-
 		$event = [];
 		$event['id']        = intval(defaults($arr, 'id'       , 0));
 		$event['uid']       = intval(defaults($arr, 'uid'      , 0));
@@ -418,7 +416,6 @@ class Event extends BaseObject
 			"February"  => L10n::t("February"),
 			"March"     => L10n::t("March"),
 			"April"     => L10n::t("April"),
-			"May"       => L10n::t("May"),
 			"June"      => L10n::t("June"),
 			"July"      => L10n::t("July"),
 			"August"    => L10n::t("August"),
@@ -643,7 +640,7 @@ class Event extends BaseObject
 	 *
 	 * @todo  Implement timezone support
 	 */
-	private static function formatListForExport(array $events, $format, $timezone)
+	private static function formatListForExport(array $events, $format)
 	{
 		if (!count($events)) {
 			return '';
@@ -795,19 +792,14 @@ class Event extends BaseObject
 	{
 		$process = false;
 
-		$user = DBA::selectFirst('user', ['timezone'], ['uid' => $uid]);
-		if (DBA::isResult($user)) {
-			$timezone = $user['timezone'];
-		}
-
 		// Get all events which are owned by a uid (respects permissions).
 		$events = self::getListByUserId($uid);
 
 		// We have the events that are available for the requestor.
 		// Now format the output according to the requested format.
-		$res = self::formatListForExport($events, $format, $timezone);
+		$res = self::formatListForExport($events, $format);
 
-		// If there are results the precess was successfull.
+		// If there are results the precess was successful.
 		if (!empty($res)) {
 			$process = true;
 		}
diff --git a/src/Model/GContact.php b/src/Model/GContact.php
index c077aa6b4a..43375b9afb 100644
--- a/src/Model/GContact.php
+++ b/src/Model/GContact.php
@@ -528,8 +528,6 @@ class GContact
 	 */
 	public static function updateSuggestions()
 	{
-		$a = \get_app();
-
 		$done = [];
 
 		/// @TODO Check if it is really neccessary to poll the own server
diff --git a/src/Model/Group.php b/src/Model/Group.php
index 606e379f05..0af10995b4 100644
--- a/src/Model/Group.php
+++ b/src/Model/Group.php
@@ -316,8 +316,6 @@ class Group extends BaseObject
 	 */
 	public static function displayGroupSelection($uid, $gid = 0, $label = '')
 	{
-		$o = '';
-
 		$stmt = DBA::select('group', [], ['deleted' => 0, 'uid' => $uid], ['order' => ['name']]);
 
 		$display_groups = [
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 7207958c2f..f18ca088f9 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1236,12 +1236,16 @@ class Item extends BaseObject
 	// This function will finally cover most of the preparation functionality in mod/item.php
 	public static function prepare(&$item)
 	{
+		/*
+		 * @TODO: Unused code triggering inspection errors
+		 *
 		$data = BBCode::getAttachmentData($item['body']);
 		if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $item['body'], $match, PREG_SET_ORDER) || isset($data["type"]))
 			&& ($posttype != Item::PT_PERSONAL_NOTE)) {
 			$posttype = Item::PT_PAGE;
 			$objecttype = ACTIVITY_OBJ_BOOKMARK;
 		}
+		 */
 	}
 
 	public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
@@ -3040,7 +3044,6 @@ class Item extends BaseObject
 		// Contact-id is the uid-dependant author contact
 		if (local_user() == $uid) {
 			$item_contact_id = $owner_self_contact['id'];
-			$item_contact = $owner_self_contact;
 		} else {
 			$item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
 			$item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
@@ -3167,8 +3170,6 @@ class Item extends BaseObject
 			$item["mention"] = 1;
 		}
 
-		$sql = "";
-
 		$fields = [];
 
 		foreach ($item as $field => $data) {
diff --git a/src/Model/Photo.php b/src/Model/Photo.php
index 6f2bbd0039..67ab217cd4 100644
--- a/src/Model/Photo.php
+++ b/src/Model/Photo.php
@@ -172,7 +172,6 @@ class Photo extends BaseObject
 	 */
 	public static function getImageForPhoto(array $photo)
 	{
-		$data = "";
 		if ($photo["backend-class"] == "") {
 			// legacy data storage in "data" column
 			$i = self::selectFirst(["data"], ["id" => $photo["id"]]);
@@ -268,7 +267,6 @@ class Photo extends BaseObject
 		// if is an existing photo, reuse same backend
 		$data = "";
 		$backend_ref = "";
-		$backend_class = "";
 
 		if (DBA::isResult($existing_photo)) {
 			$backend_ref = (string)$existing_photo["backend-ref"];
@@ -276,6 +274,7 @@ class Photo extends BaseObject
 		} else {
 			$backend_class = StorageManager::getBackend();
 		}
+
 		if ($backend_class === "") {
 			$data = $Image->asString();
 		} else {
diff --git a/src/Model/Profile.php b/src/Model/Profile.php
index 27bb12a3c8..b5e54474b8 100644
--- a/src/Model/Profile.php
+++ b/src/Model/Profile.php
@@ -745,14 +745,8 @@ class Profile
 
 	public static function getAdvanced(App $a)
 	{
-		$o = '';
 		$uid = $a->profile['uid'];
 
-		$o .= Renderer::replaceMacros(
-			Renderer::getMarkupTemplate('section_title.tpl'),
-			['$title' => L10n::t('Profile')]
-		);
-
 		if ($a->profile['name']) {
 			$tpl = Renderer::getMarkupTemplate('profile_advanced.tpl');
 
diff --git a/src/Model/Storage/Filesystem.php b/src/Model/Storage/Filesystem.php
index b5bc883b4b..bb68731cd0 100644
--- a/src/Model/Storage/Filesystem.php
+++ b/src/Model/Storage/Filesystem.php
@@ -60,7 +60,6 @@ class Filesystem implements IStorage
 			if (!mkdir($path, 0770, true)) {
 				Logger::log('Failed to create dirs ' . $path);
 				throw new StorageException(L10n::t('Filesystem storage failed to create "%s". Check you write permissions.', $path));
-				killme();
 			}
 		}
 
@@ -100,7 +99,6 @@ class Filesystem implements IStorage
 		if ($r === FALSE) {
 			Logger::log('Failed to write data to ' . $file);
 			throw new StorageException(L10n::t('Filesystem storage failed to save data to "%s". Check your write permissions', $file));
-			killme();
 		}
 		return $ref;
 	}
diff --git a/src/Model/User.php b/src/Model/User.php
index 3627333780..80cae7b0d2 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -438,7 +438,6 @@ class User
 		$return = ['user' => null, 'password' => ''];
 
 		$using_invites = Config::get('system', 'invitation_only');
-		$num_invites   = Config::get('system', 'number_invites');
 
 		$invite_id  = !empty($data['invite_id'])  ? Strings::escapeTags(trim($data['invite_id']))  : '';
 		$username   = !empty($data['username'])   ? Strings::escapeTags(trim($data['username']))   : '';
@@ -501,8 +500,6 @@ class User
 			$openid_url = '';
 		}
 
-		$err = '';
-
 		// collapse multiple spaces in name
 		$username = preg_replace('/ +/', ' ', $username);
 
@@ -826,8 +823,6 @@ class User
 			return false;
 		}
 
-		$a = \get_app();
-
 		Logger::log('Removing user: ' . $uid);
 
 		$user = DBA::selectFirst('user', [], ['uid' => $uid]);
diff --git a/src/Module/Contact.php b/src/Module/Contact.php
index a9413e1de5..8beffb483c 100644
--- a/src/Module/Contact.php
+++ b/src/Module/Contact.php
@@ -310,7 +310,7 @@ class Contact extends BaseModule
 			return;
 		}
 
-		$r = DBA::update('contact', $fields, ['id' => $contact_id, 'uid' => local_user()]);
+		DBA::update('contact', $fields, ['id' => $contact_id, 'uid' => local_user()]);
 
 		// Update the entry in the contact table
 		Model\Contact::updateAvatar($data['photo'], local_user(), $contact_id, true);
@@ -470,7 +470,6 @@ class Contact extends BaseModule
 		$_SESSION['return_path'] = $a->query_string;
 
 		if (!empty($a->data['contact']) && is_array($a->data['contact'])) {
-			$contact_id = $a->data['contact']['id'];
 			$contact = $a->data['contact'];
 
 			$a->page['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('contact_head.tpl'), [
@@ -632,7 +631,6 @@ class Contact extends BaseModule
 				'$hidden'         => ['hidden', L10n::t('Hide this contact from others'), ($contact['hidden'] == 1), L10n::t('Replies/likes to your public posts <strong>may</strong> still be visible')],
 				'$notify'         => ['notify', L10n::t('Notification for new posts'), ($contact['notify_new_posts'] == 1), L10n::t('Send a notification of every new post of this contact')],
 				'$fetch_further_information' => $fetch_further_information,
-				'$ffi_keyword_blacklist' => $contact['ffi_keyword_blacklist'],
 				'$ffi_keyword_blacklist' => ['ffi_keyword_blacklist', L10n::t('Blacklisted keywords'), $contact['ffi_keyword_blacklist'], L10n::t('Comma separated list of keywords that should not be converted to hashtags, when "Fetch information and keywords" is selected')],
 				'$photo'          => $contact['photo'],
 				'$name'           => $contact['name'],
diff --git a/src/Module/Proxy.php b/src/Module/Proxy.php
index 6ca383f59b..221ce8d081 100644
--- a/src/Module/Proxy.php
+++ b/src/Module/Proxy.php
@@ -101,13 +101,13 @@ class Proxy extends BaseModule
 
 		// If there is an error then return a blank image
 		if ((substr($fetchResult->getReturnCode(), 0, 1) == '4') || (!$img_str)) {
-			self::responseError($request);
+			self::responseError();
 			// stop.
 		}
 
 		$image = new Image($img_str, $mime);
 		if (!$image->isValid()) {
-			self::responseError($request);
+			self::responseError();
 			// stop.
 		}
 		
@@ -157,7 +157,6 @@ class Proxy extends BaseModule
 	private static function getRequestInfo()
 	{
 		$a = self::getApp();
-		$url = '';
 		$size = 1024;
 		$sizetype = '';
 		
diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 49822c725a..9515db728a 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -1302,7 +1302,6 @@ class Probe
 			$data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
 		}
 
-		$pubkey = "";
 		if (is_array($webfinger["links"])) {
 			// The array is reversed to take into account the order of preference for same-rel links
 			// See: https://tools.ietf.org/html/rfc7033#section-4.4.4
diff --git a/src/Object/Image.php b/src/Object/Image.php
index 70344dc7c4..ae360f376d 100644
--- a/src/Object/Image.php
+++ b/src/Object/Image.php
@@ -298,8 +298,6 @@ class Image
 		$width = $this->getWidth();
 		$height = $this->getHeight();
 
-		$dest_width = $dest_height = 0;
-
 		if ((! $width)|| (! $height)) {
 			return false;
 		}
@@ -502,8 +500,6 @@ class Image
 		$width = $this->getWidth();
 		$height = $this->getHeight();
 
-		$dest_width = $dest_height = 0;
-
 		if ((!$width)|| (!$height)) {
 			return false;
 		}
@@ -693,8 +689,6 @@ class Image
 			return $string;
 		}
 
-		$quality = false;
-
 		ob_start();
 
 		// Enable interlacing
@@ -736,7 +730,6 @@ class Image
 		Logger::log('Image: guessType: '.$filename . ($fromcurl?' from curl headers':''), Logger::DEBUG);
 		$type = null;
 		if ($fromcurl) {
-			$a = \get_app();
 			$headers=[];
 			$h = explode("\n", $header);
 			foreach ($h as $l) {
@@ -835,8 +828,6 @@ class Image
 	 */
 	public static function getScalingDimensions($width, $height, $max)
 	{
-		$dest_width = $dest_height = 0;
-
 		if ((!$width) || (!$height)) {
 			return false;
 		}
@@ -967,8 +958,6 @@ class Image
 
 		$hash = Photo::newResource();
 
-		$smallest = 0;
-
 		// Pictures are always public by now
 		//$defperm = '<'.$default_cid.'>';
 		$defperm = "";
diff --git a/src/Object/Post.php b/src/Object/Post.php
index b0307fd964..2d52f4244a 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -789,7 +789,7 @@ class Post extends BaseObject
 		}
 
 		if ($conv->isWritable() && $this->isWritable()) {
-			$qc = $qcomment = null;
+			$qcomment = null;
 
 			/*
 			 * Hmmm, code depending on the presence of a particular addon?
diff --git a/src/Object/Thread.php b/src/Object/Thread.php
index c36aa8ea6e..c5795819a4 100644
--- a/src/Object/Thread.php
+++ b/src/Object/Thread.php
@@ -178,9 +178,7 @@ class Thread extends BaseObject
 	 */
 	public function getTemplateData($conv_responses)
 	{
-		$a = self::getApp();
 		$result = [];
-		$i = 0;
 
 		foreach ($this->parents as $item) {
 			if ($item->getDataValue('network') === Protocol::MAIL && local_user() != $item->getDataValue('uid')) {
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 5c9628d9ce..ea4d5ba411 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -477,8 +477,6 @@ class Processor
 			return;
 		}
 
-		$owner = User::getOwnerDataById($uid);
-
 		$cid = Contact::getIdForURL($activity['actor'], $uid);
 		if (empty($cid)) {
 			Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
@@ -513,8 +511,6 @@ class Processor
 			return;
 		}
 
-		$owner = User::getOwnerDataById($uid);
-
 		$cid = Contact::getIdForURL($activity['actor'], $uid);
 		if (empty($cid)) {
 			Logger::log('No contact found for ' . $activity['actor'], Logger::DEBUG);
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index 9949577a71..7f67bab7f5 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -379,15 +379,15 @@ class Receiver
 				if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 					ActivityPub\Processor::updateItem($object_data);
 				} elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
-					ActivityPub\Processor::updatePerson($object_data, $body);
+					ActivityPub\Processor::updatePerson($object_data);
 				}
 				break;
 
 			case 'as:Delete':
 				if ($object_data['object_type'] == 'as:Tombstone') {
-					ActivityPub\Processor::deleteItem($object_data, $body);
+					ActivityPub\Processor::deleteItem($object_data);
 				} elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
-					ActivityPub\Processor::deletePerson($object_data, $body);
+					ActivityPub\Processor::deletePerson($object_data);
 				}
 				break;
 
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index bfaa1a8955..499337acb1 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -354,8 +354,6 @@ class Transmitter
 		} else {
 			$receiver_list = Item::enumeratePermissions($item);
 
-			$mentioned = [];
-
 			foreach ($terms as $term) {
 				$cid = Contact::getIdForURL($term['url'], $item['uid']);
 				if (!empty($cid) && in_array($cid, $receiver_list)) {
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index 4786f8d620..e4269f38ec 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -181,24 +181,19 @@ class DFRN
 
 		$owner = $r[0];
 		$owner_id = $owner['uid'];
-		$owner_nick = $owner['nickname'];
 
 		$sql_post_table = "";
 
 		if (! $public_feed) {
-			$sql_extra = '';
 			switch ($direction) {
 				case (-1):
 					$sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
-					$my_id = $dfrn_id;
 					break;
 				case 0:
 					$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
-					$my_id = '1:' . $dfrn_id;
 					break;
 				case 1:
 					$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
-					$my_id = '0:' . $dfrn_id;
 					break;
 				default:
 					return false;
@@ -244,7 +239,6 @@ class DFRN
 				intval(TERM_CATEGORY),
 				intval($owner_id)
 			);
-			//$sql_extra .= FileTag::fileQuery('item',$category,'category');
 		}
 
 		if ($public_feed && ! $converse) {
@@ -1179,8 +1173,6 @@ class DFRN
 	 */
 	public static function deliver($owner, $contact, $atom, $dissolve = false, $legacy_transport = false)
 	{
-		$a = \get_app();
-
 		// At first try the Diaspora transport layer
 		if (!$dissolve && !$legacy_transport) {
 			$curlResult = self::transmit($owner, $contact, $atom);
@@ -1205,7 +1197,6 @@ class DFRN
 		Logger::log("Local rino version: ". $rino, Logger::DEBUG);
 
 		$ssl_val = intval(Config::get('system', 'ssl_policy'));
-		$ssl_policy = '';
 
 		switch ($ssl_val) {
 			case SSL_POLICY_FULL:
@@ -1442,8 +1433,6 @@ class DFRN
 	 */
 	public static function transmit($owner, $contact, $atom, $public_batch = false)
 	{
-		$a = \get_app();
-
 		if (!$public_batch) {
 			if (empty($contact['addr'])) {
 				Logger::log('Empty contact handle for ' . $contact['id'] . ' - ' . $contact['url'] . ' - trying to update it.');
@@ -1708,7 +1697,6 @@ class DFRN
 
 				if (strtotime($value) < time()) {
 					$value = str_replace($bdyear, $bdyear + 1, $value);
-					$bdyear = $bdyear + 1;
 				}
 
 				$poco["bd"] = $value;
@@ -1920,8 +1908,6 @@ class DFRN
 	 */
 	private static function processSuggestion($xpath, $suggestion, $importer)
 	{
-		$a = \get_app();
-
 		Logger::log("Processing suggestions");
 
 		/// @TODO Rewrite this to one statement
@@ -1995,7 +1981,7 @@ class DFRN
 
 		$hash = Strings::getRandomHex();
 
-		$r = q(
+		q(
 			"INSERT INTO `intro` (`uid`, `fid`, `contact-id`, `note`, `hash`, `datetime`, `blocked`)
 			VALUES(%d, %d, %d, '%s', '%s', '%s', %d)",
 			intval($suggest["uid"]),
@@ -2408,8 +2394,6 @@ class DFRN
 						$item["plink"] = $href;
 						break;
 					case "enclosure":
-						$enclosure = $href;
-
 						if (!empty($item["attach"])) {
 							$item["attach"] .= ",";
 						} else {
@@ -2596,8 +2580,6 @@ class DFRN
 			}
 		}
 
-		$enclosure = "";
-
 		$links = $xpath->query("atom:link", $entry);
 		if ($links) {
 			self::parseLinks($links, $item);
@@ -2713,8 +2695,6 @@ class DFRN
 
 		if (in_array($entrytype, [DFRN::REPLY, DFRN::REPLY_RC])) {
 			$posted_id = Item::insert($item);
-			$parent = 0;
-
 			if ($posted_id) {
 				Logger::log("Reply from contact ".$item["contact-id"]." was stored with id ".$posted_id, Logger::DEBUG);
 
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index 0087ced4b1..fadf337a6a 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -748,8 +748,6 @@ class Diaspora
 				Logger::log("Unknown message type ".$type);
 				return false;
 		}
-
-		return true;
 	}
 
 	/**
@@ -2354,8 +2352,6 @@ class Diaspora
 	 */
 	private static function receiveRequestMakeFriend(array $importer, array $contact)
 	{
-		$a = \get_app();
-
 		if ($contact["rel"] == Contact::SHARING) {
 			DBA::update(
 				'contact',
@@ -2415,7 +2411,7 @@ class Diaspora
 					$user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
 					if (DBA::isResult($user)) {
 						Logger::log("Sending share message to author ".$author." - Contact: ".$contact["id"]." - User: ".$importer["uid"], Logger::DEBUG);
-						$ret = self::sendShare($user, $contact);
+						self::sendShare($user, $contact);
 					}
 				}
 				return true;
@@ -2449,7 +2445,7 @@ class Diaspora
 
 		$batch = (($ret["batch"]) ? $ret["batch"] : implode("/", array_slice(explode("/", $ret["url"]), 0, 3))."/receive/public");
 
-		$r = q(
+		q(
 			"INSERT INTO `contact` (`uid`, `network`,`addr`,`created`,`url`,`nurl`,`batch`,`name`,`nick`,`photo`,`pubkey`,`notify`,`poll`,`blocked`,`priority`)
 			VALUES (%d, '%s', '%s', '%s', '%s','%s','%s','%s','%s','%s','%s','%s','%s',%d,%d)",
 			intval($importer["uid"]),
@@ -2489,7 +2485,7 @@ class Diaspora
 
 			$hash = Strings::getRandomHex().(string)time();   // Generate a confirm_key
 
-			$ret = q(
+			q(
 				"INSERT INTO `intro` (`uid`, `contact-id`, `blocked`, `knowyou`, `note`, `hash`, `datetime`)
 				VALUES (%d, %d, %d, %d, '%s', '%s', '%s')",
 				intval($importer["uid"]),
@@ -2520,7 +2516,7 @@ class Diaspora
 				$new_relation = Contact::FOLLOWER;
 			}
 
-			$r = q(
+			q(
 				"UPDATE `contact` SET `rel` = %d,
 				`name-date` = '%s',
 				`uri-date` = '%s',
@@ -2538,7 +2534,7 @@ class Diaspora
 			$user = DBA::selectFirst('user', [], ['uid' => $importer["uid"]]);
 			if (DBA::isResult($user)) {
 				Logger::log("Sending share message (Relation: ".$new_relation.") to author ".$author." - Contact: ".$contact_record["id"]." - User: ".$importer["uid"], Logger::DEBUG);
-				$ret = self::sendShare($user, $contact_record);
+				self::sendShare($user, $contact_record);
 
 				// Send the profile data, maybe it weren't transmitted before
 				self::sendProfile($importer["uid"], [$contact_record]);
@@ -3127,8 +3123,6 @@ class Diaspora
 	 */
 	public static function transmit(array $owner, array $contact, $envelope, $public_batch, $queue_run = false, $guid = "", $no_queue = false)
 	{
-		$a = \get_app();
-
 		$enabled = intval(Config::get("system", "diaspora_enabled"));
 		if (!$enabled) {
 			return 200;
@@ -3871,15 +3865,14 @@ class Diaspora
 			// Remove the handle
 			$handle = array_pop($signed_parts);
 
-			// Glue the parts together
-			$text = implode(";", $signed_parts);
-
-			$message = ["author" => $handle,
-					"guid" => $guid,
-					"parent_guid" => $parent_guid,
-					"text" => implode(";", $signed_parts),
-					"author_signature" => $item['signature'],
-					"parent_author_signature" => ""];
+			$message = [
+				"author" => $handle,
+				"guid" => $guid,
+				"parent_guid" => $parent_guid,
+				"text" => implode(";", $signed_parts),
+				"author_signature" => $item['signature'],
+				"parent_author_signature" => ""
+			];
 		}
 		return $message;
 	}
@@ -3996,14 +3989,6 @@ class Diaspora
 			return;
 		}
 
-		$conv = [
-			"author" => $cnv["creator"],
-			"guid" => $cnv["guid"],
-			"subject" => $cnv["subject"],
-			"created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
-			"participants" => $cnv["recips"]
-		];
-
 		$body = BBCode::toMarkdown($item["body"]);
 		$created = DateTimeFormat::utc($item["created"], DateTimeFormat::ATOM);
 
@@ -4020,12 +4005,13 @@ class Diaspora
 			$type = "message";
 		} else {
 			$message = [
-					"author" => $cnv["creator"],
-					"guid" => $cnv["guid"],
-					"subject" => $cnv["subject"],
-					"created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
-					"participants" => $cnv["recips"],
-					"message" => $msg];
+				"author" => $cnv["creator"],
+				"guid" => $cnv["guid"],
+				"subject" => $cnv["subject"],
+				"created_at" => DateTimeFormat::utc($cnv['created'], DateTimeFormat::ATOM),
+				"participants" => $cnv["recips"],
+				"message" => $msg
+			];
 
 			$type = "conversation";
 		}
diff --git a/src/Protocol/Email.php b/src/Protocol/Email.php
index dd9230fbd3..05d59a1525 100644
--- a/src/Protocol/Email.php
+++ b/src/Protocol/Email.php
@@ -178,8 +178,6 @@ class Email
 		// $partno = '1', '2', '2.1', '2.1.3', etc for multipart, 0 if simple
 		global $htmlmsg,$plainmsg,$charset,$attachments;
 
-		//echo $partno."\n";
-
 		// DECODE DATA
 		$data = ($partno)
 			? @imap_fetchbody($mbox, $uid, $partno, FT_UID|FT_PEEK)
@@ -247,9 +245,6 @@ class Email
 			$x = "";
 			foreach ($p->parts as $partno0 => $p2) {
 				$x .=  self::messageGetPart($mbox, $uid, $p2, $partno . '.' . ($partno0+1), $subtype);  // 1.2, 1.2.1, etc.
-				//if ($x) {
-				//	return $x;
-				//}
 			}
 			return $x;
 		}
@@ -559,26 +554,6 @@ class Email
 				$nextline = ltrim(substr($nextline, 1));
 			}
 
-			$firstword = strpos($nextline.' ', ' ');
-
-			$specialchars = ((substr(trim($nextline), 0, 1) == '-') ||
-					(substr(trim($nextline), 0, 1) == '=') ||
-					(substr(trim($nextline), 0, 1) == '*') ||
-					(substr(trim($nextline), 0, 1) == '·') ||
-					(substr(trim($nextline), 0, 4) == '[url') ||
-					(substr(trim($nextline), 0, 5) == '[size') ||
-					(substr(trim($nextline), 0, 7) == 'http://') ||
-					(substr(trim($nextline), 0, 8) == 'https://'));
-
-			if (!$specialchars) {
-				$specialchars = ((substr(rtrim($line), -1) == '-') ||
-						(substr(rtrim($line), -1) == '=') ||
-						(substr(rtrim($line), -1) == '*') ||
-						(substr(rtrim($line), -1) == '·') ||
-						(substr(rtrim($line), -6) == '[/url]') ||
-						(substr(rtrim($line), -7) == '[/size]'));
-			}
-
 			if (!empty($lines[$lineno])) {
 				if (substr($lines[$lineno], -1) != ' ') {
 					$lines[$lineno] .= ' ';
@@ -625,13 +600,11 @@ class Email
 		}
 
 		$quotelevel = 0;
-		$previousquote = 0;
 		$arrbodyquoted = [];
 
 		for ($i = 0; $i < count($arrbody); $i++) {
 			$previousquote = $quotelevel;
 			$quotelevel = $arrlevel[$i];
-			$currline = $arrbody[$i];
 
 			while ($previousquote < $quotelevel) {
 				$quote = "[quote]";
diff --git a/src/Protocol/Feed.php b/src/Protocol/Feed.php
index 86e831c705..3981a8860c 100644
--- a/src/Protocol/Feed.php
+++ b/src/Protocol/Feed.php
@@ -318,7 +318,6 @@ class Feed {
 				$href = "";
 				$length = "";
 				$type = "";
-				$title = "";
 
 				foreach ($enclosure->attributes AS $attribute) {
 					if (in_array($attribute->name, ["url", "href"])) {
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index 84a97c20a3..a62e126629 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -398,8 +398,6 @@ class OStatus
 		$authordata = $xpath->query('//author')->item(0);
 		$author = self::fetchAuthor($xpath, $authordata, $importer, $contact, $stored);
 
-		$entry = $xpath->query('/atom:entry');
-
 		// Reverse the order of the entries
 		$entrylist = [];
 
@@ -528,7 +526,6 @@ class OStatus
 
 				if ($valid) {
 					$default_contact = 0;
-					$key = count(self::$itemlist);
 					for ($key = count(self::$itemlist) - 1; $key >= 0; $key--) {
 						if (empty(self::$itemlist[$key]['contact-id'])) {
 							self::$itemlist[$key]['contact-id'] = $default_contact;
@@ -1191,7 +1188,6 @@ class OStatus
 		} else {
 			return "http://".$server[0]."/notice/".$conversation[1];
 		}
-		return $href;
 	}
 
 	/**
@@ -1287,8 +1283,6 @@ class OStatus
 	 */
 	private static function addHeader(DOMDocument $doc, array $owner, $filter, $feed_mode = false)
 	{
-		$a = \get_app();
-
 		$root = $doc->createElementNS(NAMESPACE_ATOM1, 'feed');
 		$doc->appendChild($root);
 
@@ -1699,7 +1693,7 @@ class OStatus
 			Logger::log("OStatus entry is from author ".$owner["url"]." - not from ".$item["author-link"].". Quitting.", Logger::DEBUG);
 		}
 
-		$title = self::entryHeader($doc, $entry, $owner, $item, $toplevel);
+		self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
 		$condition = ['uid' => $owner["uid"], 'guid' => $repeated_guid, 'private' => false,
 			'network' => [Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS]];
@@ -1764,7 +1758,7 @@ class OStatus
 			Logger::log("OStatus entry is from author ".$owner["url"]." - not from ".$item["author-link"].". Quitting.", Logger::DEBUG);
 		}
 
-		$title = self::entryHeader($doc, $entry, $owner, $item, $toplevel);
+		self::entryHeader($doc, $entry, $owner, $item, $toplevel);
 
 		$verb = NAMESPACE_ACTIVITY_SCHEMA."favorite";
 		self::entryContent($doc, $entry, $item, $owner, "Favorite", $verb, false);
diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index da42a057ed..4b8b6fff63 100644
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -63,8 +63,6 @@ class PortableContact
 	 */
 	public static function load($cid, $uid, $zcid, $url)
 	{
-		$a = \get_app();
-
 		if ($cid) {
 			if (!$url || !$uid) {
 				$contact = DBA::selectFirst('contact', ['poco', 'uid'], ['id' => $cid]);
@@ -230,7 +228,6 @@ class PortableContact
 			$friendica = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $profile);
 			if ($friendica != $profile) {
 				$server_url = $friendica;
-				$network = Protocol::DFRN;
 			}
 		}
 
@@ -238,7 +235,6 @@ class PortableContact
 			$diaspora = preg_replace("=(https?://)(.*)/u/(.*)=ism", "$1$2", $profile);
 			if ($diaspora != $profile) {
 				$server_url = $diaspora;
-				$network = Protocol::DIASPORA;
 			}
 		}
 
@@ -246,7 +242,6 @@ class PortableContact
 			$red = preg_replace("=(https?://)(.*)/channel/(.*)=ism", "$1$2", $profile);
 			if ($red != $profile) {
 				$server_url = $red;
-				$network = Protocol::DIASPORA;
 			}
 		}
 
@@ -255,7 +250,6 @@ class PortableContact
 			$mastodon = preg_replace("=(https?://)(.*)/users/(.*)=ism", "$1$2", $profile);
 			if ($mastodon != $profile) {
 				$server_url = $mastodon;
-				$network = Protocol::OSTATUS;
 			}
 		}
 
@@ -264,7 +258,6 @@ class PortableContact
 			$ostatus = preg_replace("=(https?://)(.*)/user/(.*)=ism", "$1$2", $profile);
 			if ($ostatus != $profile) {
 				$server_url = $ostatus;
-				$network = Protocol::OSTATUS;
 			}
 		}
 
@@ -273,7 +266,6 @@ class PortableContact
 			$base = preg_replace("=(https?://)(.*?)/(.*)=ism", "$1$2", $profile);
 			if ($base != $profile) {
 				$server_url = $base;
-				$network = Protocol::PHANTOM;
 			}
 		}
 
@@ -609,8 +601,6 @@ class PortableContact
 	 */
 	private static function detectPocoData(array $data)
 	{
-		$server = false;
-
 		if (!isset($data['entry'])) {
 			return false;
 		}
diff --git a/src/Util/Network.php b/src/Util/Network.php
index 4e4d329d3d..c7e7c3c5ea 100644
--- a/src/Util/Network.php
+++ b/src/Util/Network.php
@@ -92,8 +92,6 @@ class Network
 	 */
 	public static function curl($url, $binary = false, &$redirects = 0, $opts = [])
 	{
-		$ret = ['return_code' => 0, 'success' => false, 'header' => '', 'info' => '', 'body' => ''];
-
 		$stamp1 = microtime(true);
 
 		$a = \get_app();
@@ -322,7 +320,6 @@ class Network
 
 		$s = @curl_exec($ch);
 
-		$base = $s;
 		$curl_info = curl_getinfo($ch);
 
 		$curlResponse = new CurlResult($url, $s, $curl_info, curl_errno($ch), curl_error($ch));
diff --git a/src/Util/ParseUrl.php b/src/Util/ParseUrl.php
index e2bd1e4e5b..9a3de88cf2 100644
--- a/src/Util/ParseUrl.php
+++ b/src/Util/ParseUrl.php
@@ -113,8 +113,6 @@ class ParseUrl
 	 */
 	public static function getSiteinfo($url, $no_guessing = false, $do_oembed = true, $count = 1)
 	{
-		$a = \get_app();
-
 		$siteinfo = [];
 
 		// Check if the URL does contain a scheme
diff --git a/src/Util/XML.php b/src/Util/XML.php
index 09072610c1..d56b2311f3 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -287,9 +287,6 @@ class XML
 
 		//Initializations
 		$xml_array = [];
-		$parents = [];
-		$opened_tags = [];
-		$arr = [];
 
 		$current = &$xml_array; // Reference
 
diff --git a/src/Worker/Cron.php b/src/Worker/Cron.php
index 1db7d916d1..b9a8c0f2ec 100644
--- a/src/Worker/Cron.php
+++ b/src/Worker/Cron.php
@@ -143,13 +143,11 @@ class Cron
 		$manual_id  = 0;
 		$generation = 0;
 		$force      = false;
-		$restart    = false;
 
 		if ($parameter == 'force') {
 			$force = true;
 		}
 		if ($parameter == 'restart') {
-			$restart = true;
 			$generation = intval($generation);
 			if (!$generation) {
 				exit();
@@ -167,8 +165,6 @@ class Cron
 
 		Addon::reload();
 
-		$d = DateTimeFormat::utcNow();
-
 		// Only poll from those with suitable relationships,
 		// and which have a polling address and ignore Diaspora since
 		// we are unable to match those posts with a Diaspora GUID and prevent duplicates.
diff --git a/src/Worker/DBClean.php b/src/Worker/DBClean.php
index f123b2dd89..6d253e0cea 100644
--- a/src/Worker/DBClean.php
+++ b/src/Worker/DBClean.php
@@ -60,8 +60,6 @@ class DBClean {
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function removeOrphans($stage) {
-		$count = 0;
-
 		// We split the deletion in many small tasks
 		$limit = Config::get('system', 'dbclean-expire-limit', 1000);
 
diff --git a/src/Worker/OnePoll.php b/src/Worker/OnePoll.php
index 112c79c8cd..2d36ee8f47 100644
--- a/src/Worker/OnePoll.php
+++ b/src/Worker/OnePoll.php
@@ -30,11 +30,7 @@ class OnePoll
 
 		Logger::log('Start for contact ' . $contact_id);
 
-		$manual_id  = 0;
-		$generation = 0;
-		$hub_update = false;
 		$force      = false;
-		$restart    = false;
 
 		if ($command == "force") {
 			$force = true;
@@ -45,7 +41,6 @@ class OnePoll
 			return;
 		}
 
-		$d = DateTimeFormat::utcNow();
 
 		$contact = DBA::selectFirst('contact', [], ['id' => $contact_id]);
 		if (!DBA::isResult($contact)) {
@@ -580,7 +575,7 @@ class OnePoll
 								$datarray['allow_cid'] = '<' . $contact['id'] . '>';
 							}
 
-							$stored_item = Item::insert($datarray);
+							Item::insert($datarray);
 
 							switch ($mailconf['action']) {
 								case 0:
diff --git a/src/Worker/PubSubPublish.php b/src/Worker/PubSubPublish.php
index 9f5fcdcc5f..1fb1969310 100644
--- a/src/Worker/PubSubPublish.php
+++ b/src/Worker/PubSubPublish.php
@@ -26,8 +26,6 @@ class PubSubPublish
 
 	private static function publish($id)
 	{
-		$a = BaseObject::getApp();
-
 		$subscriber = DBA::selectFirst('push_subscriber', [], ['id' => $id]);
 		if (!DBA::isResult($subscriber)) {
 			return;
@@ -58,8 +56,6 @@ class PubSubPublish
 		$postResult = Network::post($subscriber['callback_url'], $params, $headers);
 		$ret = $postResult->getReturnCode();
 
-		$condition = ['id' => $subscriber['id']];
-
 		if ($ret >= 200 && $ret <= 299) {
 			Logger::log('Successfully pushed to ' . $subscriber['callback_url']);