微擎怎么调用多图上传

<?php
//上传数据PHP
$data = array("jnzs"=>serialize($_GPC["jnzs"]));

//前端HTML
<div class="form-group">
                <label for="" class="control-label col-sm-2" style="margin-right:45px">技能证书</label>
                <div class="form-controls col-sm-5">
                     {php echo tpl_form_field_multi_image('jnzs', $items['jnzs'])}
                </div>
                <div class="col-sm-1"></div>
            </div>

<?php
//调取数据PHP
public function getData()
    {
        $info = pdo_fetch("SELECT * FROM " . tablename("数据库") . " WHERE uniacid=:uniacid and y_id=:y_id", array(":uniacid" => $uniacid, ":y_id" => $y_id));
//json转化字符串
        $info["jnzs"] = unserialize($info["jnzs"]);
        foreach ($info["jnzs"] as &$value) {
            $value = $_W["attachurl"] . $value;
        }
}