Wire::addHookBefore() method

Add a hook to be executed before the hooked method

  • Use a "before" hook when you have code that should execute before a hookable method executes.
  • One benefit of using a "before" hook is that you can have it modify the arguments that are sent to the hookable method.
  • This type of hook can also completely replace a hookable method if hook populates an $event->replace property. See the HookEvent class for details.

Example

// Attach hook to a method in current object
$this->addHookBefore('Page::path', $this, 'yourHookMethodName');

// Attach hook to an inline function
$this->addHookBefore('Page::path', function($event) { ... });

// Attach hook to a procedural function
$this->addHookBefore('Page::path', 'your_function_name');

// Attach hook from single object instance ($page) to inline function
$page->addHookBefore('path', function($event) { ... }); 

Usage

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

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

Arguments

NameType(s)Description
methodstring, array

Method to hook in one of the following formats (please omit 3 leading underscores):

  • Class::method - If hooking to all object instances of the class.
  • method - If hooking 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

Array of options that can modify behavior:

  • type (string): May be either 'method' or 'property'. If property, then it will respond to $obj->property rather than $obj->method(). The default type is 'method'.
  • priority (int): A number determining the priority of a hook, where lower numbers are executed before higher numbers. The default priority is 100.

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 3.0.160

Twitter updates

  • ProcessWire 3.0.161 adds support for selector operator stacking, enabling you automatically broaden searches in a single pages.find() call— More
    26 June 2020
  • ProcessWire 3.0.160 adds powerful new text-searching operators, bringing a new level of power to page-finding API calls, especially when it comes to search engine type queries. Post also includes a demo search engine where you can test it all out live— More
    19 June 2020
  • Preview of ProcessWire 3.0.160 with auto-enable of two-factor authentication, new version of TfaEmail and TfaTotp, and new selector operators coming next week. More
    12 June 2020

Latest news

  • ProcessWire Weekly #320
    In the 320th issue of ProcessWire Weekly we're going to check out the latest core updates (ProcessWire 3.0.161), a new third party module called Fieldtype Runtime only, an IndieWeb themed article from Francesco Schwarz, and more. Read on!
    Weekly.pw / 27 June 2020
  • Powerful new text-searching abilities in 3.0.160
    In ProcessWire 3.0.160 we’ve got some major upgrades and additions to our text-search abilities. This brings a whole new level of power to $pages->find() and similar API calls, especially when it comes to search engine type queries.
    Blog / 19 June 2020
  • Subscribe to weekly ProcessWire news

“The end client and designer love the ease at which they can update the website. Training beyond how to log in wasn’t even necessary since ProcessWire’s default interface is straightforward.” —Jonathan Lahijani