Is it possible to use object in add_action?

3 comments

1. You can do this:

   class testclass {
     function test() {
       echo 'howdy';
     }
   }
   add_action('wp_head',array('testclass','test'));
   

   Or this:

   $t = new testclass();
   add_action('wp_head',array($t,'test'));
   

   It doesn’t work like…

   $t = new testclass();
   add_action('wp_head','t');
   // or this either, for good measure
   $t = new testclass();
   add_action('wp_head',array('t'));
   

   .. but I am not sure what you are trying to accomplish by using that pattern. You’ve already instantiated the class so the constructor, if present, has already ran. Without a callback method, I don’t know what you expect to happen.

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2. class MyPluginClass {
   
       public function __construct() {
   
            add_action( 'save_post', array( $this, 'myplugin_save_posts' ) );
       }
   
       public function myplugin_save_posts() {
            // do stuff here...
       }
   }
   
   $mypluginclass = new MyPluginClass(); 
   

   check in Using Add Action In Your Class in WordPress Codex

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3. In the (accepted) answer the first example is incorrect:

   class testclass() {                             
       function test() {                             
           echo 'howdy';                               
       }                                             
   }                                               
   add_action( 'wp_head', array( 'testclass', 'test' ) );
   

   It is incorrect because method test is not static.

   The correct use for the static call in the action would be:

   class testclass() {                             
       function static test() {                             
           echo 'howdy';                               
       }                                             
   }                                               
   add_action( 'wp_head', array( 'testclass', 'test' ) );
   

   you could also write it then as:

   add_action( 'wp_head', 'testclass::test' );
   

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