Ok to make it damn easy, echo the $sql variable. I bet we can learn much more from that :)

I go with delayedinsanity, you cannot use variables that don't exist (yet). You first have to create the variables that you want to be used. Both $id and $username don't exist, so they will return NULL. (NULL = basically _nothing_)

Edit// Damn too late :(

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Nunchaku! Who doesn't like martial arts? =)