Example: Check Usernames

Oilik · 07-27-2008, 05:29 PM

This is a simple function I made to check if a string is a valid username or not. If it has illegal characters not specified, it'll return false/nothing, and if it's valid it'll return true/1.

PHP Code:


			
<?php

function isValid($string){

    $string = str_replace("_","",$string);

    $string = str_replace(" ","",$string);

    $string = str_replace(".","",$string);

    $string = str_replace("-","",$string);

        if(ctype_alnum($string)){

            return true;

        }else{

            return false;

        }

}

?>

This is easier to remember than preg_replace for me :(
I've never quite understood that function...