php function集合

/*更新商品的某个字段*/
function update_goods($goods_id, $field, $value)
{
    if ($goods_id)
    {
        /* 清除缓存 */
        clear_cache_files();

        $sql = "UPDATE " . $GLOBALS['ecs']->table('goods') .
                " SET $field = '$value' , last_update = '". gmtime() ."' " .
                "WHERE goods_id " . db_create_in($goods_id);
        return $GLOBALS['db']->query($sql);
    }
    else
    {
        return false;
    }
}
function message($msg, $url = NULL, $type = 'succeed', $waitSecond = ) {
        if ($url == NULL)
            $url = 'javascript:history.back();';
        if ($type == 'error') {
            $title = '错误信息';
        } else {
            $title = '提示信息';
        }
        $data ['title'] = $title;
        $data ['message'] = $msg;
        $data ['type'] = $type;
        $data ['url'] = $url;
        $data ['second'] = $waitSecond;
        $this->assign('data', $data);
        $this->display('message');
        exit();
    }

    // 弹出信息
function alert($msg, $url = NULL, $parent = false) {
        header("Content-type: text/html; charset=utf-8");
        $alert_msg = "alert('$msg');";
        if (empty($url)) {
            $gourl = 'history.go(-1);';
        } else {
            $gourl = ($parent ? 'parent' : 'window') . ".location.href = '{$url}'";
        }
        echo "<script>$alert_msg $gourl</script>";
        exit();
    }