Merge pull request SAML-Toolkits#1 from smullick/smullick-patch-1

Update Utils.php

Author: smullick

lib/Saml2/Utils.php

@@ -727,7 +727,7 @@ public static function parseDuration($duration, $timestamp = null)
 
         /* Parse the duration. We use a very strict pattern. */
         $durationRegEx = '#^(-?)P(?:(?:(?:(\\d+)Y)?(?:(\\d+)M)?(?:(\\d+)D)?(?:T(?:(\\d+)H)?(?:(\\d+)M)?(?:(\\d+)S)?)?)|(?:(\\d+)W))$#D';
-        $matches = [];
+        $matches = array(); 
         if (!preg_match($durationRegEx, $duration, $matches)) {
             throw new Exception('Invalid ISO 8601 duration: ' . $duration);
         }