优惠券中的自定义选项卡导致“您关注的链接已过期”错误

This code is saved in ./child-theme/includes/show_coupon_usage.php and then in functions.php it\'s required if the user is an admin.

<?php

if (!defined(\'ABSPATH\')) {
    exit;
}

//Our class extends the WP_List_Table class, so we need to make sure that it\'s there
if (!class_exists(\'WP_List_Table\')) {
    require_once(ABSPATH . \'wp-admin/includes/class-wp-list-table.php\');
}

class Coupon_Usage_Table extends WP_List_Table
{

   /**
    * Constructor, we override the parent to pass our own arguments
    * We usually focus on three parameters: singular and plural labels, as well as whether the class supports AJAX.
    */
    function __construct()
    {
        parent::__construct(array(
        \'singular\'=> \'coupon_usage\', //Singular label
        \'plural\' => \'coupon_usages\', //plural label, also this well be one of the table css class
        \'ajax\'   => false //We won\'t support Ajax for this table
        ));

        $this->prepare_items();
        $this->display();
    }

    function no_items()
    {
        _e(\'This coupon hasn\\\'t been used yet.\');
    }

    /**
     * Prepare the table with different parameters, pagination, columns and table elements
     */
    function prepare_items()
    {
        global $thepostid, $post, $wpdb, $_wp_column_headers;

        $columns = $this->get_columns();
        $hidden = $this->get_hidden_columns();
        $sortable = $this->get_sortable_columns();

        $thepostid = empty($thepostid) ? $post->ID : $thepostid;

        // Get username, user ID and how many times did they use this coupon.
        $query = $wpdb->prepare("SELECT u.user_login as username, pm.meta_value as user_id,   COUNT(1) as timesused FROM {$wpdb->prefix}_posts p LEFT JOIN {$wpdb->prefix}_postmeta pm ON p.ID = pm.post_id LEFT JOIN {$wpdb->prefix}_users  u ON u.ID = pm.meta_value WHERE p.post_type = \'shop_coupon\' AND p.ID = %d AND pm.meta_key = \'_used_by\' GROUP BY pm.meta_value;", array($thepostid));

        $this->items = $wpdb->get_results($query);
        $this->_column_headers = array($columns, $hidden, $sortable);

    }

    /**
     * Define the columns that are going to be used in the table
     * @return array $columns, the array of columns to use with the table
     */
    function get_columns()
    {
        return $columns = array(
          \'username\'=>__(\'Name\'),
          \'timesused\'=>__(\'Times Used\')
        );
    }

    /**
     * Define which columns are hidden
     *
     * @return Array
     */
    public function get_hidden_columns()
    {
        return array();
    }

    /**
     * Define the sortable columns
     *
     * @return Array
     */
    public function get_sortable_columns()
    {
        return array();
    }

    function column_default($item, $column_name)
    {
        switch ($column_name) {
            case \'username\':
                $actions = array(
                    \'edit\'      => sprintf(\'<a href="/wp-admin/user-edit.php?user_id=%s">Edit</a>\', $item->user_id),
                    \'orders\'    => sprintf(\'<a href="/wp-admin/edit.php?post_status=all&post_type=shop_order&_customer_user=%s">Orders</a>\', $item->user_id),
                );
                return sprintf(\'%1$s %2$s\', $item->username, $this->row_actions($actions));
            case \'timesused\':
                return sprintf(\'%1$s\', $item->timesused);
            default:
                return print_r($item, true).\' - \'.print_r($column_name, true) ;
        }
    }
}

add_filter(\'woocommerce_coupon_data_tabs\', \'admin_coupon_options_tabs\', 20, 1);
add_action(\'woocommerce_coupon_data_panels\', \'admin_coupon_options_panels\', 10, 0);


//Add tabs to the coupon option page
function admin_coupon_options_tabs($tabs)
{

        $tabs[\'show_who_used\'] = array(
                \'label\'  => __(\'Who used it?\', \'woocommerce-coupon-usage\'),
                \'target\' => \'woocommerce_coupon_usage\',
                \'class\'  => \'woocommerce_coupon_usage\',
        );

        return $tabs;
}


//Add panels to the coupon option page
function admin_coupon_options_panels()
{
    echo \'<div id="woocommerce_coupon_usage" class="panel woocommerce_options_panel">\';
    $wp_list_table = new Coupon_Usage_Table();
    echo \'</div>\';
}

The code works fine, I can see the data I want in coupons that have already been created programatically. The problem is when I go to create one via the "Add Coupon" button or if I try to edit an existing one.

I get the The link you followed has expired. error.

Google only shows stuff about upload_max_size, post_max_size and max_execution_time but it doesn\'t seems to have anything to do with my case.

I also don\'t use a nonce in my code since it\'s purely presenting information, it takes no input.

Anyone knows what might be going on? WP_DEBUG doesn\'t show anything useful.

Edit: Checking the POST data sent with and without the code active on the same coupon I see this:

This is with my code active

_wp_original_http_referer: 
_wpnonce: 4d92197b82
_wpnonce: e5b47d577d

referredby:

This is with my code inactive

_wp_original_http_referer: https://example.net/wp-admin/edit.php?post_type=shop_coupon

_wpnonce: e5b47d577d

referredby: https://example.net/wp-admin/edit.php?post_type=shop_coupon

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