- var_dump: documentation ( source)
- md5: documentation ( source)
<?php
$username = 'fem';
$password = '3bpvblW7';
$challenge = '';
$challenge_res = '0c07042fb4d065fd3baae50b511be2fb';
$challenge_cmp = md5($username.md5($password).$challenge);
var_dump($challenge_cmp);