/**
* Register the helper for view template engine.
*
* @param mixed $name
* @param Closure $callback
* @return Closure
*/
public function register($name, \Closure $callback)
{
if (array_key_exists($name, $this->helpers) || method_exists($this, $name)) {
throw new \InvalidArgumentException('Helper name already registered!');
}
if (!$this->app->isValidMethodName($name)) {
throw new \InvalidArgumentException('Invalid helper function name!');
}
$this->helpers[$name] = $callback;
}
