<?php



class Haanga_Extension_Filter_Substr

{

    public static function generator($cmp, $args)

    {

        if (count($args) != 2) {

            $cmp->Error("substr parameter must have one param");

        }

        if (!isset($args[1]['string'])) {

            $cmp->Error("substr parameter must be a string");

        }

        list($start, $end) = explode(",", $args[1]['string']);

        return hexec('substr', $args[0],  (int)$start, (int)$end);

    }

}