[wirehopper]

Nico - good point about trim.

PHP Code:

$aBad=array('password','notnice','ugly', ...);  /* All lowercase */ 

/* Make username lowercase for comparison */ 

if (in_array(strtolower(trim($slc)),$aBad)) die('Bad username'); 

If you find you have a really long list, I'd store it in a text file and use grep, on the commandline. It's unlikey you'll ever need it.