Passing urls as path arguments in urls

Sometimes you want to pass a url as a path argument. Drupal explodes urls by slash (/) to get the separate "arguments". Since the passed url probably also contains slashes, this will give erroneous results.

Using the following functions (compress_string and decompress_string) you can safely pass urls now and read them well at the other end.

Example:

print url('bookmark/add/'. compress_string('some/path/on/my/site?query=test'));

function compress_string($string) {
  return urlsafe_base64_encode(gzcompress($string, 9));
}

function decompress_string($string) {
  return gzuncompress(urlsafe_base64_decode($string));
}

function urlsafe_base64_encode($string) {
    $data = base64_encode($string);
    $data = str_replace(array('+','/','='),array('-','_',''),$data);
    return $data;
}

function urlsafe_base64_decode($string) {
    $data = str_replace(array('-','_'),array('+','/'),$string);
    $mod4 = strlen($data) % 4;
    if ($mod4) {
        $data .= substr('====', $mod4);
    }
    return base64_decode($data);
}