Fix 11 errors

src/Util/HTTPSignature.php

@@ -7,6 +7,7 @@
 
 namespace Friendica\Util;
 
+use Exception;
 use Friendica\Core\Protocol;
 use Friendica\Database\Database;
 use Friendica\Database\DBA;
@@ -213,7 +214,7 @@ class HTTPSignature
 
 		$headers = [];
 		foreach ($matches as $match) {
-			$headers[$match[1]] = trim($match[2] ?: $match[3], '"');
+			$headers[$match[1]] = trim((string) $match[2], '"');
 		}
 
 		// if the header is encrypted, decrypt with (default) site private key and continue
@@ -537,14 +538,12 @@ class HTTPSignature
 
 		if (!empty($uid)) {
 			$owner = User::getOwnerDataById($uid);
-			if (!$owner) {
-				return;
-			}
 		} else {
 			$owner = User::getSystemAccount();
-			if (!$owner) {
-				return;
-			}
+		}
+
+		if (!$owner) {
+			throw new Exception('Could not find owner for uid ' . $uid);
 		}
 
 		if (!empty($owner['uprvkey'])) {

src/Util/JsonLD.php

@@ -243,14 +243,11 @@ class JsonLD
 
 		return json_decode(json_encode($json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
 	}
+
 	/**
 	 * Fetches an element array from a JSON array
 	 *
-	 * @param $array
-	 * @param $element
-	 * @param $key
-	 *
-	 * @return array fetched element
+	 * @return array|null fetched element or null
 	 */
 	public static function fetchElementArray($array, $element, $key = null, $type = null, $type_value = null)
 	{

src/Util/ReversedFileReader.php

@@ -26,13 +26,13 @@ class ReversedFileReader implements \Iterator
 	/** @var int */
 	private $pos = -1;
 
-	/** @var array */
+	/** @var array|null */
 	private $buffer = null;
 
 	/** @var int */
 	private $key = -1;
 
-	/** @var string */
+	/** @var string|null */
 	private $value = null;
 
 	/**
@@ -53,6 +53,7 @@ class ReversedFileReader implements \Iterator
 		$this->buffer   = null;
 		$this->key      = -1;
 		$this->value    = null;
+
 		return $this;
 	}
 

src/Util/Strings.php

@@ -209,7 +209,7 @@ class Strings
 	{
 		// If this method is called for an infinite (== unlimited) amount of bytes:
 		if ($bytes == INF) {
-			return INF;
+			return 'INF';
 		}
 
 		$units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
@@ -509,7 +509,7 @@ class Strings
 			function ($matches) use ($blocks) {
 				$return = $matches[0];
 				if (isset($blocks[intval($matches[1])])) {
-					$return = $blocks[$matches[1]];
+					$return = $blocks[intval($matches[1])];
 				}
 				return $return;
 			},

src/Util/Temporal.php

@@ -405,7 +405,7 @@ class Temporal
 	 */
 	public static function getDaysInMonth(int $y, int $m): int
 	{
-		return date('t', mktime(0, 0, 0, $m, 1, $y));
+		return (int) date('t', mktime(0, 0, 0, $m, 1, $y));
 	}
 
 	/**

src/Util/XML.php

@@ -184,7 +184,7 @@ class XML
 	 * @param integer $recursion_depth recursion counter for internal use - default 0
 	 *                                 internal use, recursion counter
 	 *
-	 * @return array | string The array from the xml element or the string
+	 * @return array|string|null The array from the xml element or the string
 	 */
 	public static function elementToArray($xml_element, int &$recursion_depth = 0)
 	{