[PhpUnitBridge] fix PHP 5.5 support

Author: nicolas-grekas

DeprecationErrorHandler/Configuration.php

@@ -138,7 +138,7 @@ public function verboseOutput()
      *
      * @return self
      */
-    public static function fromUrlEncodedString(string $serializedConfiguration)
+    public static function fromUrlEncodedString($serializedConfiguration)
     {
         parse_str($serializedConfiguration, $normalizedConfiguration);
         foreach (array_keys($normalizedConfiguration) as $key) {
@@ -157,7 +157,7 @@ public static function fromUrlEncodedString(string $serializedConfiguration)
         }
 
         return new self(
-            $normalizedConfiguration['max'] ?? [],
+            isset($normalizedConfiguration['max']) ? $normalizedConfiguration['max'] : [],
             '',
             $verboseOutput
         );
@@ -193,15 +193,15 @@ public static function inWeakMode()
     /**
      * @return self
      */
-    public static function fromNumber(int $upperBound)
+    public static function fromNumber($upperBound)
     {
         return new self(['total' => $upperBound]);
     }
 
     /**
      * @return self
      */
-    public static function fromRegex(string $regex)
+    public static function fromRegex($regex)
     {
         return new self([], $regex);
     }