接下来, 我们用一个类模板来启用/禁用/卸载插件. 该类文件来自WPSE.
在主文件latex2html.php末尾添加内容如下:

<?php
/**
 * The active/deactive/uninstall hooks
 */
register_activation_hook( __FILE__, array( 'active_deactive_class', 'on_activation' ) );
register_deactivation_hook( __FILE__, array( 'active_deactive_class', 'on_deactivation' ) );
register_uninstall_hook( __FILE__, array( 'active_deactive_class', 'on_uninstall' ) );

/**
 * Instanize the class
 */
add_action('plugins_loaded', array('active_deactive_class', 'init'));

/**
 * The active/deactive class
 */
class active_deactive_class
{
  protected static $instance;

  public static function init()
  {
    is_null ( self::$instance ) AND self::$instance = new self;
    return self::$instance;
  }
  /**
   * activation
   */
  public static function on_activation()
  {
    if ( !current_user_can('activate_plugins') )
      return;
    $plugin = isset ( $_REQUEST['plugin'] ) ? $_REQUEST['plugin'] : '';
    check_admin_referer( "activate-plugin_{$plugin}" );

    # Uncomment the following line to see the function in action
    # exit ( var_dump( $_GET ) );
  }
  /**
   * deactivation
   */
  public static function on_deactivation()
  {
    if ( !current_user_can( 'activate_plugins' ) )
      return;
    $plugin = isset ( $_REQUEST['plugin'] ) ? $_REQUEST['plugin'] : '';
    check_admin_referer( "deactivate-plugin_{$plugin}" );

    # Uncomment the following line to see the funcion in action
    # exit( var_dump( $_GET ) );
  }
  /**
   * uninstall
   */
  public static function on_uninstall()
  {
    if ( !current_user_can( 'activate_plugins' ) )
      return;
    check_admin_referer( 'bulk-plugins' );

    // Important: Check if the file is the one
    // thatn was registered during the uninstall hook.
    if ( __FILE__ != WP_UNINSTALL_PLUGIN )
      return;

    # Uncomment the following line to see the function in action
    # exit( var_dump( $_GET ) );
  }
  /**
   * Construct the plugin object
   */
  public function __construct()
  {
    # INIT the plugin: Hook your callbacks
  }

在下一次, 我们将涉及如何设置插件的自定义页面.

附注: 可以参考php类文档以及WP的register_activation_hook中会提及的一些注意事项, 例如全局变量的引用.

疑问: 我尝试将上述代码放入到一个文件includes/active-deactive.php, 然后在主文件中include_once调入, 发现该文件没有执行, 原因不详.