Simple Drupal hook_menu

Question

I would like to pass data from Javascript to PHP using Drupal 7.14. To this end, I'm trying to follow this SO post: https://stackoverflow.com/questions/4834132/how-to-pass-jquery-variable-to-drupal-ajax.

However, |hook_menu()` is not working as expected.

function example_module_menu() {
  $items = array();

  $items['example_callback/%'] = array(
    'title' => 'My Custom Callback', 
    'description' => 'Description', 
    'page callback' => 'my_custom_php_function', 
    'page arguments' => array(1), // fill this
    // 'access arguments' => array('access content'), 
    'access callback' => true,
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Function that gets called from JQuery asynchronously. 
 */
function my_custom_php_function($argument) {
  // Do something with $argument...
  echo $argument;   
}

In my understanding, going to http://mywebsite.com/example_callback should call my_custom_php_function. Instead, I get:

The requested URL /example_callback was not found on this server.

Are there other steps necessary to write a simple menu callback?

Answer 1

Your URL is expecting an argument so your URL would have to be http://mywebsite.com/example_callback/something. I wouldn't bother with the extra % in the path though.

So you should be doing something like and it will still pick up the arguments:

function example_module_menu() {
  $items = array();

  $items['example_callback'] = array(
    'title' => 'My Custom Callback',
    'page callback' => 'my_custom_php_function',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
 );

 return $items;
}

/**
* Function that gets called from JQuery asynchronously. 
*/
function my_custom_php_function() {
  if (arg(1)) {
    // this means there is an argument
    // Do something with $argument...
  }
  return '';
}