PayPal\Core\PPUtils::array_match_key PHP Method

    public static function array_match_key($map, $key)
    {
        $replace = str_replace(array('(', ')', '.'), array('\\(', '\\)', '\\.'), $key);
        $pattern = "/{$replace}*/";
        foreach ($map as $k => $v) {
            preg_match($pattern, $k, $matches);
            if (count($matches) > 0) {
                return true;
            }
        }
        return false;
    }

 /**
  * @test
  */
 public function testArray_match_key()
 {
     $arr = array('key1' => 'somevalue', 'key2' => 'someothervalue');
     $this->assertEquals(PPUtils::array_match_key($arr, "key"), true);
     $arr = unserialize('a:10:{s:26:"responseEnvelope.timestamp";s:35:"2011-04-19T04%3A32%3A29.469-07%3A00";s:20:"responseEnvelope.ack";s:7:"Failure";s:30:"responseEnvelope.correlationId";s:13:"c2514f258ddf1";s:22:"responseEnvelope.build";s:7:"1829457";s:16:"error(0).errorId";s:6:"580027";s:15:"error(0).domain";s:8:"PLATFORM";s:17:"error(0).severity";s:5:"Error";s:17:"error(0).category";s:11:"Application";s:16:"error(0).message";s:44:"Prohibited+request+parameter%3A+businessInfo";s:21:"error(0).parameter(0)";s:12:"businessInfo";}');
     $this->assertEquals(PPUtils::array_match_key($arr, "error(0)."), true);
 }