I am working on a username suggester.

I would like to explode at character type change then ignore numbers and special characters to turn...

mad_willsy into array("mad", "willsy")
bob1 into array("bob")
SomeWierdUsername array("Some", "Wierd", "Username")

etc

Thanks...

off the top off my head ... might have some small glitches in it

$str = 'abCd_ef';
$i=0;
for ($j=0;$j<=strlen($str);$j++){
$char=substr($str,$i,1);
$next_char=substr($str,$i+1,1);
if ($char=='_') {
$i++;
} elseif {
$words[$i].=$char
$curent_case= ( $char === strtolower($char) ) ? 'lower' : 'upper';
$next_case= ( $next_char === strtolower($next_char) ) ? 'lower' : 'upper';
if ($curent_case !== $next_case) $i++;
}
}

1. preg_replace upper case letters with space and letter
2. replace all non-letters with spaces
3. preg_replace multiple spaces with single space
4. trim
5. explode