WordPress: Override parent theme class function in child theme

问题

I want to override function in child theme, which is defined inside a class in parent theme.

Here is the sample code:

class A extends B{
   function __construct(){
      $this->add_ajax('sync_post_data', 'need_to_override');
   }
   //other functions
   function need_to_override(){
      //function code
   }

}

Additional Information:

Class B extends Class C and Class C is the root class where add_ajax is defined.

What I've tried:

1. As the function is not pluggable so I can't override function directly in child theme.

2. Secondly I tried to remove ajax action and add my custom action. It throws 500 internal server error.

   remove_action( 'wp_ajax_sync_post_data', 'need_to_override' );
   add_action( 'wp_ajax_sync_post_data', 'custom_function' );
   
   function custom_function(){
      //function code with my custom modification
   }
   

Any help please...

回答1:

You can just override that method of class in just two simple steps.

Here's how:

1. Open child theme functions.php

2. Create new class like this:

   add_action( 'after_setup_theme', function() {
   
   
      class D extends A{
   
         function need_to_override(){
            //original function code with your custom modifications
         }
   
      }
   
      new D();
   });
   

PS: It will work but I'm not sure if it is the best way or not!

来源：https://stackoverflow.com/questions/53293310/wordpress-override-parent-theme-class-function-in-child-theme