/**
* Call error handler
*
* This will invoke the custom or default error handler
* and RETURN its output.
*
* @param \Exception|null $argument
* @return string
*/
protected function callErrorHandler($argument = null)
{
ob_start();
$customErrorHandler = $this->router->error();
if (is_callable($customErrorHandler)) {
call_user_func_array($customErrorHandler, array($argument));
} else {
call_user_func_array(array($this, 'defaultError'), array($argument));
}
return ob_get_clean();
}
