- substr: documentation ( source)
- md5: documentation ( source)
<?php
$offset = 8;
echo md5(substr("Foo===/Bar; Expires=42; Path=path; Domain=FooDomain.bar; Secure; HttpOnly", 0, $offset));
echo "\n";
echo md5(substr("Foo===/Baz; Expires=42; Path=path; Domain=FooDomain.bar; Secure; HttpOnly", 0, $offset));