Returns a URL-safe, base64 encoded version of the supplied string.
$string: The string to convert to base64.
string
function drupal_base64_encode($string) {
$data = base64_encode($string);
// Modify the output so it's safe to use in URLs.
return strtr($data, array(
'+' => '-',
'/' => '_',
'=' => '',
));
}