有三个不同的挂钩。它们在以下情况下触发：

• 卸载
• 停用
• 激活

如何在场景中安全触发函数

以下显示了安全挂接在上述操作中触发的回调函数的正确方法。

因为您可以在使用

普通函数、类或外部类，我将显示三种不同的demo plugins 您可以在自己的插件中检查并稍后实现代码。

重要提示提前

由于这个主题非常困难，非常详细，有十几个以上的边缘案例，这个答案永远不会完美。随着时间的推移，我会不断改进，所以请定期查看。

（1） 激活/停用/卸载插件

• Never, 曾经echo/print 任何事（！）在安装回调期间。这将导致headers already sent 消息和核心将建议停用和删除您的插件。。。不要问：我知道
• 您将看不到任何视觉输出<但是我添加了exit() 对所有不同回调的声明，以便您能够了解实际发生的情况。只需取消对它们的注释，就可以看到它们在工作__FILE__ != WP_PLUGIN_INSTALL 和（如果不是：中止！）看看是否真的在卸载插件。我建议直接触发on_deactivation() 在开发过程中进行回调，这样您就节省了恢复所有内容所需的时间。至少我是这样做的<首先，我不允许在未加载core时直接访问文件：defined( \'ABSPATH\' ) OR exit;wp_die() 当您遇到错误时，屏幕会询问适当的权限（如果您想再试一次…，当然可以）。当core重定向您、设置当前$GLOBALS[\'wp_list_table\']->current_action(); 到error_scrape 然后检查推荐人check_admin_referer(\'plugin-activation-error_\' . $plugin);, 哪里$plugin 是$_REQUEST[\'plugin\']. 因此，重定向发生在页面加载量的一半时，您会看到这个有线滚动条，并看到黄色的管理通知/消息框。如果发生这种情况：保持冷静，用一些exit() 以及逐步调试

  <?php
  defined( \'ABSPATH\' ) OR exit;
  /**
   * Plugin Name: (WCM) Activate/Deactivate/Uninstall - Functions
   * Description: Example Plugin to show activation/deactivation/uninstall callbacks for plain functions.
   * Author:      Franz Josef Kaiser/wecodemore
   * Author URL:  http://unserkaiser.com
   * Plugin URL:  http://wordpress.stackexchange.com/questions/25910/uninstall-activate-deactivate-a-plugin-typical-features-how-to/25979#25979
   */
  
  function WCM_Setup_Demo_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 ) );
  }
  
  function WCM_Setup_Demo_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 function in action
      # exit( var_dump( $_GET ) );
  }
  
  function WCM_Setup_Demo_on_uninstall()
  {
      if ( ! current_user_can( \'activate_plugins\' ) )
          return;
      check_admin_referer( \'bulk-plugins\' );
  
      // Important: Check if the file is the one
      // that 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 ) );
  }
  
  register_activation_hook(   __FILE__, \'WCM_Setup_Demo_on_activation\' );
  register_deactivation_hook( __FILE__, \'WCM_Setup_Demo_on_deactivation\' );
  register_uninstall_hook(    __FILE__, \'WCM_Setup_Demo_on_uninstall\' );
  

  （B）基于类的/面向对象架构这是当今插件中最常见的例子。

  <?php
  defined( \'ABSPATH\' ) OR exit;
  /**
   * Plugin Name: (WCM) Activate/Deactivate/Uninstall - CLASS
   * Description: Example Plugin to show activation/deactivation/uninstall callbacks for classes/objects.
   * Author:      Franz Josef Kaiser/wecodemore
   * Author URL:  http://unserkaiser.com
   * Plugin URL:  http://wordpress.stackexchange.com/questions/25910/uninstall-activate-deactivate-a-plugin-typical-features-how-to/25979#25979
   */
  
  
  register_activation_hook(   __FILE__, array( \'WCM_Setup_Demo_Class\', \'on_activation\' ) );
  register_deactivation_hook( __FILE__, array( \'WCM_Setup_Demo_Class\', \'on_deactivation\' ) );
  register_uninstall_hook(    __FILE__, array( \'WCM_Setup_Demo_Class\', \'on_uninstall\' ) );
  
  add_action( \'plugins_loaded\', array( \'WCM_Setup_Demo_Class\', \'init\' ) );
  class WCM_Setup_Demo_Class
  {
      protected static $instance;
  
      public static function init()
      {
          is_null( self::$instance ) AND self::$instance = new self;
          return self::$instance;
      }
  
      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 ) );
      }
  
      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 function in action
          # exit( var_dump( $_GET ) );
      }
  
      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
          // that 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 ) );
      }
  
      public function __construct()
      {
          # INIT the plugin: Hook your callbacks
      }
  }
  

  （C）带有外部安装对象的基于类的/面向对象体系结构此场景假定您有一个主插件文件和另一个名为setup.php 在名为inc: ~/wp-content/plugins/your_plugin/inc/setup.php. 当插件文件夹位于默认WP文件夹结构之外时，以及当内容目录重命名或安装文件命名不同时，这也会起作用。只有inc 文件夹必须具有相同的名称（&；相对于插件根目录的位置。

  注意：您只需取三个register_*_hook()* 函数和类，并将它们放入插件中

  主插件文件：

  <?php
  defined( \'ABSPATH\' ) OR exit;
  /**
   * Plugin Name: (WCM) Activate/Deactivate/Uninstall - FILE/CLASS
   * Description: Example Plugin
   * Author:      Franz Josef Kaiser/wecodemore
   * Author URL:  http://unserkaiser.com
   * Plugin URL:  http://wordpress.stackexchange.com/questions/25910/uninstall-activate-deactivate-a-plugin-typical-features-how-to/25979#25979
   */
  
  
  register_activation_hook(   __FILE__, array( \'WCM_Setup_Demo_File_Inc\', \'on_activation\' ) );
  register_deactivation_hook( __FILE__, array( \'WCM_Setup_Demo_File_Inc\', \'on_deactivation\' ) );
  register_uninstall_hook(    __FILE__, array( \'WCM_Setup_Demo_File_Inc\', \'on_uninstall\' ) );
  
  add_action( \'plugins_loaded\', array( \'WCM_Setup_Demo_File\', \'init\' ) );
  class WCM_Setup_Demo_File
  {
      protected static $instance;
  
      public static function init()
      {
          is_null( self::$instance ) AND self::$instance = new self;
          return self::$instance;
      }
  
      public function __construct()
      {
          add_action( current_filter(), array( $this, \'load_files\' ), 30 );
      }
  
      public function load_files()
      {
          foreach ( glob( plugin_dir_path( __FILE__ ).\'inc/*.php\' ) as $file )
              include_once $file;
      }
  }
  

  安装文件：

  <?php
  defined( \'ABSPATH\' ) OR exit;
  
  class WCM_Setup_Demo_File_Inc
  {
      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 ) );
      }
  
      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 function in action
          # exit( var_dump( $_GET ) );
      }
  
      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
          // that 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 ) );
      }
  }
  

  （2）插件更新如果您编写的插件有自己的DB表或选项，可能会出现需要更改或升级的情况。

  遗憾的是，到目前为止，还不可能在插件/主题安装或更新/升级上运行某些东西。很高兴有一个解决方法：将自定义函数挂接到自定义选项上（是的，这很蹩脚，但很有效）。

  function prefix_upgrade_plugin() 
  {
      $v = \'plugin_db_version\';
      $update_option = null;
      // Upgrade to version 2
      if ( 2 !== get_option( $v ) ) 
      {
          if ( 2 < get_option( $v ) )
          {
              // Callback function must return true on success
              $update_option = custom_upgrade_cb_fn_v3();
  
              // Only update option if it was an success
              if ( $update_option )
                  update_option( $v, 2 );
          }
      }
  
      // Upgrade to version 3, runs just after upgrade to version 2
      if ( 3 !== get_option( $v ) ) 
      {
          // re-run from beginning if previous update failed
          if ( 2 < get_option( $v ) )
              return prefix_upgrade_plugin();
  
          if ( 3 < get_option( $v ) )
          {
              // Callback function must return true on success
              $update_option = custom_upgrade_cb_fn_v3();
  
              // Only update option if it was an success
              if ( $update_option )
                  update_option( $v, 3 );
          }
      }
  
      // Return the result from the update cb fn, so we can test for success/fail/error
      if ( $update_option )
          return $update_option;
  
  return false;
  }
  add_action(\'admin_init\', \'prefix_upgrade_plugin\' );
  

  <支持>Source

  这个更新函数不是一个很好/写得不好的示例，但正如所说的那样：这是一个示例，该技术运行良好。将在以后的更新中对此进行改进。