[php] base 64 url safe

<?php
	function base64url_encode($data) {
	return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
	}
	function base64url_decode($data) {
	return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
	}

?>