public function has(string $key): bool
    {
        $result = $this->iterateConfig($key);

        return !($result === null);
    }
public function has(string $key): bool
    {
        $result = $this->iterateConfig($key);

        return !($result === null);
    }
public function has ( string $ key ) : bool { $ result = $ this -> iterateConfig ( $ key ) ; return ! ( $ result === null ) ; }
Return of givent key is present.

@param  string $key
@return boolean
Return of givent key is present .