PHP: safe url compress and base64

gistfile1.php

<?php
$str= "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc ut elit id mi ultricies adipiscing. Nulla facilisi. Praesent pulvinar, sapien vel feugiat vestibulum, nulla dui pretium orci, non ultricies elit lacus quis ante. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam pretium ullamcorper urna quis iaculis. Etiam ac massa sed turpis tempor luctus. Curabitur sed nibh eu elit mollis congue. Praesent ipsum diam, consectetur vitae ornare a, aliquam a nunc. In id magna pellentesque tellus posuere adipiscing. Sed non mi metus, at lacinia augue. Sed magna nisi, ornare in mollis in, mollis sed nunc. Etiam at justo in leo congue mollis. Nullam in neque eget metus hendrerit scelerisque eu non enim. Ut malesuada lacus eu nulla bibendum id euismod urna sodales.";

function base64_url_encode($input)
{
    $compressed = gzcompress($input, 9);
    return strtr(base64_encode($compressed), '+/=', '-_,');
}

function base64_url_decode($input)
{
    $unbase64ed = base64_decode(strtr($input, '-_,', '+/='));
	return gzuncompress($unbase64ed);
}
echo "<pre>";
$base64ed = base64_url_encode($str);
echo $base64ed . "<br />";
echo base64_url_decode($base64ed) . "<br />";
echo "</pre>";
?>