[wp-trac] [WordPress Trac] #22256: Hook namespacing

[WordPress Trac]

#22256: Hook namespacing
-------------------------+------------------------------
 Reporter:  scribu       |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Plugins      |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |
-------------------------+------------------------------
Description changed by scribu:

Old description:

> Currently, callbacks passed to add_action() and add_filter() are already
> sort of namespaced by the hook name, by the callback itself, by priority
> and by argument count. You need to know all of them in order to use
> `remove_action()` successfully.
>
> Acquiring the callback is especially problematic when it's:
>
> * an instance method, and you don't have access to the instance
> * a PHP 5.3 closure
>
> Introducing namespaces for hooks, similar to jQuery's
> [http://docs.jquery.com/Namespaced_Events namespaced events], would not
> only take care of that problem, but also enable things like removing all
> callbacks added by plugin X, regardless of hook name or anything else.
>
> Proposed syntax:
>
> {{{
> add_action( 'after_setup_theme.twentytwelve', function() {
>   // do stuff
> }
>
> add_action( 'after_setup_theme.twentytwelve', function() {
>   // do more stuff
> }
>
> add_filter( 'posts_clauses.p2p', function( $clauses ) {
>   // do stuff
> }
> }}}
>
> Later:
>
> {{{
> // remove specific callbacks added by the Twentytwelve theme
> remove_action( 'after_setup_theme.twentytwelve' );
>
> // remove all callbacks added by the P2P plugin
> remove_action( '*.p2p' );
> }}}

New description:

 Currently, callbacks passed to add_action() and add_filter() are already
 sort of namespaced by the hook name, by priority and by the callback
 itself. You need to know all of them in order to use `remove_action()`
 successfully.

 Acquiring the callback is especially problematic when it's:

 * an instance method, and you don't have access to the instance
 * a PHP 5.3 closure

 Introducing namespaces for hooks, similar to jQuery's
 [http://docs.jquery.com/Namespaced_Events namespaced events], would not
 only take care of that problem, but also enable things like removing all
 callbacks added by plugin X, regardless of hook name or anything else.

 Proposed syntax:

 {{{
 add_action( 'after_setup_theme.twentytwelve', function() {
   // do stuff
 }

 add_action( 'after_setup_theme.twentytwelve', function() {
   // do more stuff
 }

 add_filter( 'posts_clauses.p2p', function( $clauses ) {
   // do stuff
 }
 }}}

 Later:

 {{{
 // remove specific callbacks added by the Twentytwelve theme
 remove_action( 'after_setup_theme.twentytwelve' );

 // remove all callbacks added by the P2P plugin
 remove_action( '*.p2p' );
 }}}

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Ticket URL: <http://core.trac.wordpress.org/ticket/22256#comment:3>
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