Ajax callback for Drupal AJAX commands article

my_module.module.php

<?php
/**
 * AJAX callback that prints hello world underneath our link.
 */
function MY_CUSTOM_MODULE_ajax_callback() {
  // Define a new array to hold our AJAX commands.
  $ajax_commands = array();
    
  // Create a new AJAX command that replaces the #page text with our own text.
  $ajax_commands[] = ajax_command_after('#my-special-link', 'Hello world');
   
  // Return our commands in JSON.
  ajax_deliver(array('#type' => 'ajax', '#commands' => $ajax_commands));
}