How to add backup and restore functionality to WordPress plugin

How to add backup and restore function to WordPress plug-in

When using WordPress to develop plug-ins, the backup and restore function is a very important function. It can help us when the plug-in appears. Easily save and restore data when problems arise or when you need to migrate your website. This article will explain how to add backup and restore functionality to a WordPress plugin and provide code examples.

1. Create database table

First, we need to create a database table to store the backup data. Open phpMyAdmin or other database management tools, create a new table, and name it.

CREATE TABLE `wp_plugin_backup` (
  `id` mediumint(9) NOT NULL AUTO_INCREMENT,
  `backup_data` longtext NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. Add menu options and pages

We need to add a submenu option to the WordPress backend plugin menu for backup and restore operations. Open your plug-in main file and add the following code in the add_action function:

add_action('admin_menu', 'plugin_add_menu');

function plugin_add_menu() {
    add_submenu_page(
        'options-general.php',
        '插件备份还原',
        '插件备份还原',
        'manage_options',
        'plugin-backup-page',
        'plugin_backup_page_callback'
    );
}

Then, create a new PHP file in the same directory as the main file and name it plugin_backup_page.php, and add the following code:

function plugin_backup_page_callback() {
    ?>
    <div class="wrap">
        <h1><?php echo esc_html(get_admin_page_title()); ?></h1>
        <form action="<?php echo admin_url('admin-post.php'); ?>" method="post">
            <input type="hidden" name="action" value="plugin_backup">
            <?php wp_nonce_field('plugin_backup_action', 'plugin_backup_nonce'); ?>
            <input type="submit" class="button button-primary" value="备份插件数据">
        </form>
        <br>
        <form action="<?php echo admin_url('admin-post.php'); ?>" method="post">
            <input type="hidden" name="action" value="plugin_restore">
            <?php wp_nonce_field('plugin_restore_action', 'plugin_restore_nonce'); ?>
            <input type="submit" class="button" value="恢复插件数据">
        </form>
    </div>
    <?php
}

3. Backup data

Next, we need to add the code for the backup function. Open your plugin main file and add the following code:

add_action('admin_post_plugin_backup', 'plugin_backup');

function plugin_backup() {
    if (!current_user_can('manage_options')) {
        wp_die('You do not have sufficient permissions to access this page.');
    }

    check_admin_referer('plugin_backup_action', 'plugin_backup_nonce');

    global $wpdb;
    $table_name = $wpdb->prefix . 'plugin_backup';
    $backup_data = json_encode(/* 这里根据你的插件需要备份的数据来进行获取 */);

    $wpdb->insert($table_name, array('backup_data' => $backup_data));

    wp_redirect(admin_url('options-general.php?page=plugin-backup-page'));
    exit;
}

4. Restore Data

Finally, we need to add the code for the restore function. Also in the main plugin file, add the following code:

add_action('admin_post_plugin_restore', 'plugin_restore');

function plugin_restore() {
    if (!current_user_can('manage_options')) {
        wp_die('You do not have sufficient permissions to access this page.');
    }

    check_admin_referer('plugin_restore_action', 'plugin_restore_nonce');

    global $wpdb;
    $table_name = $wpdb->prefix . 'plugin_backup';
    $latest_backup = $wpdb->get_var("SELECT backup_data FROM $table_name ORDER BY id DESC LIMIT 1");
    $restored_data = json_decode($latest_backup, true);

    /* 这里根据你的插件需要还原的数据来进行相应的操作 */

    wp_redirect(admin_url('options-general.php?page=plugin-backup-page'));
    exit;
}

At this point, we have implemented the backup and restore function of the WordPress plugin. When users access the plug-in management menu in the background, they can click the "Backup plug-in data" button to back up the data, and click the "Restore plug-in data" button to restore the data.

The author suggests that in actual development, the backup and restored data can be further processed and optimized according to specific needs. At the same time, WordPress database operation classes $wpdb and appropriate data serialization methods can be flexibly used to adapt to plug-in development needs in different situations.

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