向wordpress的Post“Publish”框添加自定义复选框

<?php
/**
 * Plugin Name: Custom Checkbox
 * Description: Add a custom checkbox to the Publish meta box
 * Version: 1.0
 */

// Add a custom checkbox to the Publish meta box
function add_custom_checkbox() {
    // Get the current post ID
    $post_id = get_the_ID();
    
    // Get the value of the custom checkbox
    $custom_checkbox_value = get_post_meta($post_id, 'custom_checkbox', true);
    
    // Output the custom checkbox
    ?>
    <div class="misc-pub-section">
        <label for="custom_checkbox">
            <input type="checkbox" name="custom_checkbox" id="custom_checkbox" value="1" <?php checked($custom_checkbox_value, '1'); ?>>
            Custom Checkbox
        </label>
    </div>
    <?php
}

// Save the value of the custom checkbox when the post is saved
function save_custom_checkbox($post_id) {
    if (isset($_POST['custom_checkbox'])) {
        update_post_meta($post_id, 'custom_checkbox', $_POST['custom_checkbox']);
    } else {
        delete_post_meta($post_id, 'custom_checkbox');
    }
}

// Hook the functions into WordPress
add_action('post_submitbox_misc_actions', 'add_custom_checkbox');
add_action('save_post', 'save_custom_checkbox');