convert string to unix-friendly filename

[the_reverend]

Is there a built-in function for this??? Or do I need to create some ultra-complicated ereg_replace() statement for it?

Thanks,
-John

[the_reverend]

Is this good enough? Am I forgetting anything?

function unixFriendly($string) {
$string = ereg_replace(" ","",$string);
$string = ereg_replace("[^a-zA-Z0-9]","",$string);
$string = strtolower($string);
return $string;
}