Validate

    //var $validate
    var $validate = array(
        //............................
        , 'logo' => array(
            'cekExt' => array(
                'rule' => array('cekExt', array('jpg'))
                , 'message' => 'Extensi yang diperbolehkan hanya jpg'
            )
            , 'filenameEmpty' => array(
                //jika file gagal diupload
                'rule' => 'filenameEmpty'
                , 'message' => 'Kesalahan teknis. Upload file gagal dilakukan. Silahkan hubungi Administrator system Anda'
            )
        )
    );


    //ngisore filenameNotEmpty
    public function cekExt($check, $extensions = array() ) {
        foreach($check as $aryProp){
            if(!empty($aryProp['name'])){
                #kemungkinan nak isih ra iso, manggil Class iki error e
                #cobanen utek uteken nak gelem :D
                #nak ra yo suk we hahahaha...
                return Validation::extension($check, $extensions);
            }
            return true;
        }
    }