note 87113 deleted from function.ctype-digit by salathe

Note Submitter: Anonymous ---- Indeed, ctype_digit only functions correctly on strings. Cast your vars to string before you test them. Also, be wary and only use ctype_digit if you're sure your var contains either a string or int, as boolean true for ex will convert to int 1. To be truly safe, you need to check the type of the var first. Here's a wrapper function that improves upon ctype_digit's broken implementation: <?php // replacement for ctype_digit, to properly // handle (via return value false) nulls, // booleans, objects, resources, etc. function ctype_digit2 ($str) { return (is_string($str) || is_int($str) || is_float($str)) && ctype_digit((string)$str); } ?> If, like me, you're not willing to take a chance on ctype_digit having other problems, use this version: <?php // replacement for ctype_digit, to properly // handle (via return value false) nulls, // booleans, objects, resources, etc. function ctype_digit2 ($str) { return (is_string($str) || is_int($str) || is_float($str)) && preg_match('/^\d+\z/', $str); } ?>