Simple Smarty Plugin for generating a random integer

function.app_rand.php

<?php
/**
 * Smarty plugin wrapper for PHP's rand function
 *
 * @package Smarty
 * @subpackage PluginsFunction
 */
/**
 * Smarty {app_rand} function plugin
 *
 * Type:     function<br>
 * Name:     app_rand<br>
 * Date:     Feb 17, 2011<br>
 * Purpose:  generate a random integer
 * Examples: <img src="/images/image{app_rand low=1 high=10}.gif" width="400" height="23"">
 * Output:   <img src="/images/image1.gif" width="400" height="23"">
 *
 * @author Tim Swann <https://github.com/faffyman/>
 * @version 1.0
 * @param array $params parameters
 * Input:<br>
 *          - low = lowest number
 *          - high = highest number
 * @return string/int
 */
function smarty_function_app_rand($params, $template)
{
    $low = 0;
    $high = 99;
    foreach($params as $_key => $_val) {
        switch ($_key) {
            case 'low':
            case 'high':
                $$_key = intval($_val);
                break;

            default:
             throw new SmartyException ("app_rand: extra attribute not allowed ", E_USER_NOTICE);
             break;
        }
    }

    if (empty($high)) {
        trigger_error("app_rand: missing 'high' number parameter", E_USER_NOTICE);
        return;
    }


    $nRandom = rand($low,$high);
    return $nRandom;
}

?>