public static function isThrottled($response) {
	  $return_data = FALSE;
    
    // check the variable
	  if(!empty($response) && is_string($response)) {
	    // we have an array and have a properly formatted LinkedIn response
	       
      // store the response in a temp variable
      $temp_response = self::xmlToArray($response);
  	  if($temp_response !== FALSE) {
    	  // check to see if we have an error
    	  if(array_key_exists('error', $temp_response) && ($temp_response['error']['children']['status']['content'] == 403) && preg_match('/throttle/i', $temp_response['error']['children']['message']['content'])) {
    	    // we have an error, it is 403 and we have hit a throttle limit
  	      $return_data = TRUE;
    	  }
  	  }
  	}
  	return $return_data;
	}