Php Code Help

[insanctus]

I am trying to learn more about php . I posted this code in another part tryin to get input on the hack I was hacking.

Seeing as it is also something I very much want to understand why it does not work I will try in this part.

PHP Code:

// END CONFIG
$ttb_username="whatever";
$usernamelen = strlen($ttb_username);
if ($ttb==1 AND rand(1,100)<=$ttb_weighting AND  $ttb_username=substr($message, 0, $usernamelen) AND $bbuserinfo[userid]!=$ttb_memberid) {gottb();};
$message=substr_replace($message, "", 0, $usernamelen); 


Please someone explain why it does not take parse the $message

I am used to visual basics and some of php makes sence just others do not.

Thanks in advance.