The fourth parameter of add_event_handler function was used to tell the number of parameters which will be transmitted to the callback. This is no longer used: all parameters given to trigger_change or trigger_notify are always transmitted to all callback.

But the fourth parameter is still used: if a string is given it will be used as a file path included just before the callback (with include_once).

// procedural
add_event_handler('init', 'my_init',
  EVENT_HANDLER_PRIORITY_NEUTRAL,
  MY_PLUGIN_PATH . 'include/callbacks.php'
  );
 
// OOP with static method
add_event_handler('init', array('MyClass', 'init'),
  EVENT_HANDLER_PRIORITY_NEUTRAL,
  MY_PLUGIN_PATH . 'include/myclass.php'
  );

If the 4th parameter is anything else than a string it is ignored.

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We added an option to disable or enable the website field on comment add form. You must wrap the field in a IF block:

{if $comment_add.SHOW_WEBSITE} ... {/if}