urlsafe base64 function.

gistfile1.php

<?php

function base64_urlsafe_encode($val) {
	$val = base64_encode($val);
	return str_replace(array('+', '/', '='), array('_', '-', '.'), $val);
}

function base64_urlsafe_decode($val) {
	$val = str_replace(array('_','-', '.'), array('+', '/', '='), $val);
	return base64_decode($val);
}