PHP md5() gives different output then MySQL md5

I'm trying to set up a login system, but I can't solve one problem: PHP is giving me an other output with md5(); than MySQL...

For example, in PHP:

$password = md5("brickmasterj");
return $password;

Returns:

3aa7b18f304e2e2a088cfd197351cfa8

But the MySQL equivalent gives me a shorter version:

3aa7b18f304e2e2a08

What's the problem? And how do I work with this while checking passwords?