- var_dump: documentation ( source)
- base64_encode: documentation ( source)
<?php
$str = 'a:4:{s:8:"id_admin";s:2:"97";s:4:"type";s:4:"sale";s:15:"id_organisation";s:3:"283";s:8:"id_entry";i:1535;}';
$encoded = base64_encode($str);
$url_encoded = base64url_encode($str);
var_dump($encoded, $url_encoded);