Fix many strict errors

.phpstan.neon

@@ -26,6 +26,7 @@ parameters:
     dynamicConstantNames:
         - DB_UPDATE_VERSION
 
+    # See all rules at https://github.com/phpstan/phpstan-strict-rules/blob/2.0.x/rules.neon
     strictRules:
         allRules: false
 

src/Content/Pager.php

@@ -215,8 +215,8 @@ class Pager
 
 			// Limit the number of displayed page number buttons.
 			if ($numpages > 8) {
-				$numstart = (($this->getPage() > 4) ? ($this->getPage() - 4) : 1);
+				$numstart = ($this->getPage() > 4) ? ($this->getPage() - 4) : 1;
-				$numstop = (($this->getPage() > ($numpages - 7)) ? $numpages : ($numstart + 8));
+				$numstop = ($this->getPage() > ($numpages - 7)) ? $numpages : ($numstart + 8);
 			}
 
 			$pages = [];

src/Content/Text/HTML.php

@@ -55,7 +55,7 @@ class HTML
 
 		$xpath = new DOMXPath($doc);
 
-		/** @var \DOMNode[] $list */
+		/** @var \DOMNodeList<\DOMNode>|false $list */
 		$list = $xpath->query("//" . $tag);
 		foreach ($list as $node) {
 			$attr = [];
@@ -1018,7 +1018,7 @@ class HTML
 	 */
 	public static function checkRelMeLink(DOMDocument $doc, UriInterface $meUrl): bool
 	{
-		$xpath = new \DOMXpath($doc);
+		$xpath = new \DOMXPath($doc);
 
 		// This expression checks that "me" is among the space-delimited values of the "rel" attribute.
 		// And that the href attribute contains exactly the provided URL

src/Core/Lock/Type/AbstractLock.php

@@ -28,7 +28,7 @@ abstract class AbstractLock implements ICanLock
 	 */
 	protected function hasAcquiredLock(string $key): bool
 	{
-		return isset($this->acquireLock[$key]) && $this->acquiredLocks[$key] === true;
+		return isset($this->acquiredLocks[$key]) && $this->acquiredLocks[$key] === true;
 	}
 
 	/**

src/Core/Session/Handler/Cache.php

@@ -99,8 +99,11 @@ class Cache extends AbstractSessionHandler
 	}
 
 	#[\ReturnTypeWillChange]
-	public function gc($max_lifetime): bool
+	/**
+	 * @return int|false
+	 */
+	public function gc($max_lifetime)
 	{
-		return true;
+		return 0; // Cache does not support garbage collection, so we return 0 to indicate no action taken
 	}
 }

src/Core/Session/Handler/Database.php

@@ -124,13 +124,23 @@ class Database extends AbstractSessionHandler
 	}
 
 	#[\ReturnTypeWillChange]
-	public function gc($max_lifetime): bool
+	/**
+	 * @return int|false
+	 */
+	public function gc($max_lifetime)
 	{
 		try {
-			return $this->dba->delete('session', ["`expire` < ?", time()]);
+			$result = $this->dba->delete('session', ["`expire` < ?", time()]);
 		} catch (\Exception $exception) {
 			$this->logger->warning('Cannot use garbage collector.', ['exception' => $exception]);
 			return false;
 		}
+
+		if ($result !== false) {
+			// TODO: DBA::delete() returns true, but we need to return the number of deleted rows as interger
+			$result = 0;
+		}
+
+		return $result;
 	}
 }

src/Core/Worker.php

@@ -521,7 +521,7 @@ class Worker
 		}
 
 		if ($sleeping) {
-			DI::logger()->info('Cooldown ended.', ['max-load' => $load_cooldown, 'max-processes' => $processes_cooldown, 'load' => $load, 'called-by' => System::callstack(1)]);
+			DI::logger()->info('Cooldown ended.', ['max-load' => $load_cooldown, 'max-processes' => $processes_cooldown, 'load' => $load ?? [], 'called-by' => System::callstack(1)]);
 		}
 	}
 

src/Database/PostUpdate.php

@@ -193,7 +193,7 @@ class PostUpdate
 			Contact::removeDuplicates($contact['nurl'], $contact['uid']);
 		}
 
-		DBA::close($contact);
+		DBA::close($contacts);
 		DI::keyValue()->set('post_update_version', 1322);
 
 		DI::logger()->info('Done');

src/Network/Probe.php

@@ -8,7 +8,7 @@
 namespace Friendica\Network;
 
 use DOMDocument;
-use DomXPath;
+use DOMXPath;
 use Exception;
 use Friendica\Content\Text\HTML;
 use Friendica\Core\Hook;
@@ -1273,7 +1273,7 @@ class Probe
 			return [];
 		}
 
-		$xpath = new DomXPath($doc);
+		$xpath = new DOMXPath($doc);
 
 		$vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
 		if (!is_object($vcards)) {

src/Object/Image.php

@@ -363,12 +363,11 @@ class Image
 	 * Rotates image
 	 *
 	 * @param integer $degrees degrees to rotate image
-	 * @return mixed
 	 */
-	public function rotate(int $degrees)
+	public function rotate(int $degrees): void
 	{
 		if (!$this->isValid()) {
-			return false;
+			return;
 		}
 
 		if ($this->isImagick()) {
@@ -393,12 +392,11 @@ class Image
 	 *
 	 * @param boolean $horiz optional, default true
 	 * @param boolean $vert  optional, default false
-	 * @return mixed
 	 */
-	public function flip(bool $horiz = true, bool $vert = false)
+	public function flip(bool $horiz = true, bool $vert = false): void
 	{
 		if (!$this->isValid()) {
-			return false;
+			return;
 		}
 
 		if ($this->isImagick()) {

src/Util/HTTPSignature.php

@@ -592,7 +592,7 @@ class HTTPSignature
 			return [];
 		}
 
-		$sig_block = self::parseSigHeader($http_headers['HTTP_SIGNATURE']);
+		$sig_block = self::parseSigheader($http_headers['HTTP_SIGNATURE']);
 
 		if (empty($sig_block['keyId'])) {
 			DI::logger()->debug('No keyId', ['sig_block' => $sig_block]);
@@ -652,7 +652,7 @@ class HTTPSignature
 			}
 		}
 
-		$sig_block = self::parseSigHeader($http_headers['HTTP_SIGNATURE']);
+		$sig_block = self::parseSigheader($http_headers['HTTP_SIGNATURE']);
 
 		// Add fields from the signature block to the header. See issue 8845
 		if (!empty($sig_block['created']) && empty($headers['(created)'])) {