//获取下载按钮
function zibpay_get_post_down_buts($pay_mate, $paid_type = 'pay', $post_id = '')
{
    if (empty($pay_mate['pay_download'])) {
        return '<div class="muted-2-color text-center">暂无可下载资源</div>';
    }

    $down     = zibpay_get_post_down_array($pay_mate);
    $con      = '';
    $down_but = '';
    if (!$post_id) {
        global $post;
        $post_id = $post->ID;
    }

    $down_url = zib_pay_get_download_url($post_id);

    foreach ($down as $key => $down_v) {
        $down_link = add_query_arg(array('down_id' => $key), $down_url);
        $down_name = !empty($down_v['name']) ? $down_v['name'] : '本地下载';
        $icon      = '<i class="fa fa-download" aria-hidden="true"></i>';
        $class     = 'b-theme';
        if (stripos($down_v['link'], 'weiyun') || stripos($down_v['link'], 'qq')) {
            $class .= ' weiyun';
            $down_name = $down_v['name'] ? $down_v['name'] : '腾讯微云';
            $icon      = zib_get_svg('weiyun', '0 0 1400 1024');
        }
        if (stripos($down_v['link'], 'baidu')) {
            $class .= ' baidu';
            $down_name = $down_v['name'] ? $down_v['name'] : '百度网盘';
            $icon      = zib_get_svg('pan_baidu');
        }
        if (stripos($down_v['link'], 'lanzou')) {
            $down_name = $down_v['name'] ? $down_v['name'] : '蓝奏云';
            $class .= ' lanzou';
            $icon = zib_get_svg('lanzou');
        }
        if (stripos($down_v['link'], 'onedrive') || stripos($down_v['link'], 'sharepoint')) {
            $down_name = $down_v['name'] ? $down_v['name'] : 'OneDrive';
            $class .= ' onedrive';
            $icon = zib_get_svg('onedrive');
        }
        if (stripos($down_v['link'], '.189.')) {
            $down_name = $down_v['name'] ? $down_v['name'] : '天翼云';
            $class .= ' tianyi';
            $icon = zib_get_svg('tianyi');
        }
        if (stripos($down_v['link'], 'ctfile')) {
            $down_name = $down_v['name'] ? $down_v['name'] : '城通网盘';
            $class .= ' ctfile';
            $icon = zib_get_svg('ctfile', '0 0 1260 1024');
        }

        $class = !empty($down_v['class']) ? $down_v['class'] : $class;
        $icon  = !empty($down_v['icon']) ? zib_get_cfs_icon($down_v['icon']) : $icon;

        $copy_key  = !empty($down_v['copy_key']) ? $down_v['copy_key'] : (!empty($down_v['copy_val']) ? '更多内容' : '');
        $down_more = $down_v['more'] ? $down_v['more'] : $copy_key;

        $down_more = $down_more ? '<span class="badg">' . $down_v['more'] . '</span>' : '';

        if (!empty($down_v['copy_val'])) {
            $down_more = '<a href="javascript:;" data-clipboard-tag="' . esc_attr($copy_key) . '" data-clipboard-text="' . esc_attr($down_v['copy_val']) . '" class="but">' . $down_v['more'] . '</a>';
        }

        $down_but .= '<div class="but-download flex ac"><a target="_blank" href="' . $down_link . '" class="mr10 but ' . $class . '">' . $icon . $down_name . '</a>' . $down_more . '</div>';
    }

    if (!$down_but) {
        return '<div class="muted-2-color text-center">暂无可下载资源</div>';
    }

    $down_but = '<div class="flex ac hh">' . $down_but . '</div>';

    //限制下载次数
    $download_limit_html = '';
    $user_id             = get_current_user_id();
    if ($user_id && stristr($paid_type, 'free')) {
        //免费资源限制下载次数
        $download_limit   = 0;
        $user_vip_level   = zib_get_user_vip_level($user_id);
        $user_down_number = zibpay_get_user_down_number($user_id);

        if ($user_vip_level && _pz('pay_user_vip_' . $user_vip_level . '_s', true)) {
            $download_limit = _pz('vip_benefit', 0, 'pay_download_limit_vip_' . $user_vip_level);
        } else {
            $download_limit = _pz('vip_benefit', 0, 'pay_download_limit');
        }

        if ($download_limit) {
            $surplus = $download_limit - $user_down_number; //计算剩余下载次数
            if ($surplus < 1) {
                $down_but = '<div class=""><span class="badg c-red btn-block">您今日下载免费资源个数已超限，请明日再下载</span></div>';
            } else {
                $_text    = $user_vip_level ? '您是尊贵的' . _pz('pay_user_vip_' . $user_vip_level . '_name') . '，' : '您';
                $down_but = '<div class=""><span class="badg c-red btn-block">' . $_text . '今日还可下载' . $surplus . '个免费资源</span></div>' . $down_but;
            }
        }

        $download_limit       = _pz('vip_benefit', 0, 'pay_download_limit');
        $download_limit_vip_1 = _pz('vip_benefit', 0, 'pay_download_limit_vip_1');
        $download_limit_vip_2 = _pz('vip_benefit', 0, 'pay_download_limit_vip_2');

        if ($download_limit || $download_limit_vip_1 || $download_limit_vip_2) {
            $download_limit_html = '<div class="mb10" style=" padding: 10px 20px; background:var(--muted-border-color); border-radius: 4px; ">';
            $download_limit_html .= '<div class="mb6">免费资源每日可下载：</div>';
            $download_limit_html .= $download_limit ? '<div class="mb6">普通用户：' . ($download_limit ? $download_limit . '个' : '不限制') . '</div>' : '';
            $download_limit_html .= $download_limit_vip_1 ? '<div class="mb6">' . _pz('pay_user_vip_1_name') . '：' . ($download_limit_vip_1 ? $download_limit_vip_1 . '个' : '不限制') . '</div>' : '';
            $download_limit_html .= $download_limit_vip_2 ? '<div class="">' . _pz('pay_user_vip_2_name') . '：' . ($download_limit_vip_2 ? $download_limit_vip_2 . '个' : '不限制') . '</div>' : '';
            $download_limit_html .= '</div>';
        }
    }

    $con .= '<div>';
    $con .= $download_limit_html;
    $con .= $down_but;
    $con .= '</div>';

    return $con;
}

我想设置某个下载渠道只能是含一级以上的会员才能使用，代码怎么改，麻烦代码大佬们帮忙看下。