文本数据库cms

<?php
/*
Plugin Name: Custom Field Example
Description: Adds a custom field to the post editor.
Version: 1.0
Author: Your Name
*/

function add_custom_field() {
    add_meta_box(
        'custom_field_box',
        'Custom Field',
        'render_custom_field',
        'post',
        'normal',
        'high'
    );
}
add_action('add_meta_boxes', 'add_custom_field');

function render_custom_field($post) {
    wp_nonce_field(basename(__FILE__), 'custom_field_nonce');
    $value = get_post_meta($post->ID, '_custom_field', true);
?>
    <label for="custom_field">Custom Field:</label>
    <input type="text" id="custom_field" name="custom_field" value="<?php echo esc_attr($value); ?>">
<?php
}

function save_custom_field($post_id) {
    if (!isset($_POST['custom_field_nonce']) || !wp_verify_nonce($_POST['custom_field_nonce'], basename(__FILE__))) {
        return $post_id;
    }
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return $post_id;
    }
    if (!current_user_can('edit_post', $post_id)) {
        return $post_id;
    }
    $value = sanitize_text_field($_POST['custom_field']);
    update_post_meta($post_id, '_custom_field', $value);
}
add_action('save_post', 'save_custom_field');