Wire::addHookMethod() method

Add a hook accessible as a new public method in a class (or object)

  • This enables you to add a new accessible public method to an existing object, which will execute your hook implementation method when called upon.

  • Hook method can accept arguments and/or populate return values, just like any other regular method in the class. However, methods such as this do not have access to private or protected properties/methods in the class.

  • Methods added like this themselves become hookable as well.

Available since version 3.0.16. Added as an alias to addHook() for syntactic clarity, previous versions can use addHook() method with same arguments.

Example

// Adds a myHasParent($parent) method to all Page objects
$wire->addHookMethod('Page::myHasParent', function($event) {
  $page = $event->object;
  $parent = $event->arguments(0);
  if(!$parent instanceof Page) {
    throw new WireException("Page::myHasParent() requires a Page argument");
  }
  if($page->parents()->has($parent)) {
    // this page has the given parent
    $event->return = true;
  } else {
    // does not have the given parent
    $event->return = false;
  }
});

// Calling the new method (from any instance)
$parent = $pages->get('/products/');
if($page->myHasParent($parent)) {
  // $page has the given $parent
} 

Usage

// basic usage
$string = $wire->addHookMethod(string $method, $toObject);

// usage with all arguments
$string = $wire->addHookMethod(string $method, $toObject, $toMethod = null, array $options = []);

Arguments

NameType(s)Description
methodstring

Name of method you want to add, must not collide with existing property or method names:

  • Class::method to add the method to all instances of Class.
  • method to just add to a single object instance.
  • Since 3.0.137 it may also be multiple methods to hook in CSV string or array.
toObjectobject, null, callable

Specify one of the following:

  • Object instance to call $toMethod from (like $this).
  • Inline function (closure) if providing implemention inline.
  • Procedural function name, if hook is implemented by a procedural function.
  • Null if you want to use the 3rd argument and don't need this argument.
toMethod (optional)string, array

Method from $toObject, or function name to call on a hook event. This argument can be sustituted as the 2nd argument when the 2nd argument isn’t needed, or it can be the $options argument.

options (optional)array

Options typically aren't used in this context, but see Wire::addHookBefore() $options if you'd like.

Return value

string

A special Hook ID (or CSV string of hook IDs) that should be retained if you need to remove the hook later.


Wire methods and properties

API reference based on ProcessWire core version 3.0.209

Twitter updates

  • Adding custom actions to ProcessWire image fields in the admin, part of this week’s dev branch additions: More
    27 January 2023
  • ProcessWire 3.0.210 new main/master version released— More
    6 January 2023
  • ProcessWire 3.0.209: Core updates and an interesting AI that knows ProcessWire– More
    30 December 2022

Latest news

  • ProcessWire Weekly #456
    The 456th issue of ProcessWire Weekly covers latest core updates, introduces a new third party module called TextformatterRockDown, and more. Read on!
    Weekly.pw / 4 February 2023
  • ProcessWire 3.0.210 new main/master version
    140 commits, 55 resolved issues, dozens of new features, eight contributors, and five new pull requests make yet another great new version of ProcessWire.
    Blog / 6 January 2023
  • Subscribe to weekly ProcessWire news

“To Drupal, or to ProcessWire? The million dollar choice. We decided to make an early switch to PW. And in retrospect, ProcessWire was probably the best decision we made. Thanks are due to ProcessWire and the amazing system and set of modules that are in place.” —Unni Krishnan, Founder of PigtailPundits