WordPressプラグインに自動リンク機能を追加する方法

// 添加"Automatic Links"子菜单
function add_automatic_links_menu() {
   add_options_page(
      'Automatic Links',
      'Automatic Links',
      'manage_options',
      'automatic-links',
      'automatic_links_options_page'
   );
}
add_action('admin_menu', 'add_automatic_links_menu');

// 显示设置页面
function automatic_links_options_page() {
   // 设置页面的HTML代码
}

// 注册设置
function register_automatic_links_setting() {
   register_setting('automatic_links_options', 'automatic_links_keywords');
}
add_action('admin_init', 'register_automatic_links_setting');

// 保存表单数据
function save_automatic_links_settings() {
   if (isset($_POST['action']) && $_POST['action'] == 'update') {
      update_option('automatic_links_keywords', $_POST['automatic_links_keywords']);
   }
}
add_action('admin_post_save_automatic_links_settings', 'save_automatic_links_settings');

// 显示设置页面
function automatic_links_options_page() {
   ?>
   <div class="wrap">
      <h1>Automatic Links</h1>
      <form method="post" action="options.php">
         <?php settings_fields('automatic_links_options'); ?>
         <?php do_settings_sections('automatic_links_options'); ?>
         <table class="form-table">
            <tr valign="top">
               <th scope="row">关键词</th>
               <td>
                  <input type="text" name="automatic_links_keywords" value="<?php echo esc_attr(get_option('automatic_links_keywords')); ?>" />
               </td>
            </tr>
         </table>
         <?php submit_button(); ?>
      </form>
   </div>
   <?php
}

// 自动为关键词添加链接
function automatic_links_auto_link($content) {
   $keywords = get_option('automatic_links_keywords');
   if ($keywords) {
      foreach ($keywords as $keyword => $link) {
         $content = preg_replace('/(' . $keyword . ')/i', '<a href="' . $link . '">$1</a>', $content);
      }
   }
   return $content;
}
add_filter('the_content', 'automatic_links_auto_link');