Merge pull request #290 from sarciszewski/patch-1

Remove side-effects in hash_equals()

src/TokenType/MAC.php

@@ -128,9 +128,9 @@ class MAC extends AbstractTokenType implements TokenTypeInterface
      */
     private function hash_equals($knownString, $userString)
     {
-        if (!function_exists('hash_equals')) {
+        if (function_exists('\hash_equals')) {
-            function hash_equals($knownString, $userString)
+            return \hash_equals($knownString, $userString);
-            {
+        }
         if (strlen($knownString) !== strlen($userString)) {
             return false;
         }
@@ -142,8 +142,4 @@ class MAC extends AbstractTokenType implements TokenTypeInterface
         // They are only identical strings if $result is exactly 0...
         return 0 === $result;
     }
-        }
-
-        return hash_equals($knownString, $userString);
-    }
 }