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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 556 | } |
| 557 | |
| 558 | return; |
| 559 | } |
| 560 | |
| 561 | if ( ! isset( $wp_filter['all'] ) ) { |
| 562 | $wp_current_filter[] = $hook_name; |
| 563 | } |
| 564 | |
| 565 | $wp_filter[ $hook_name ]->do_action( $args ); |
| 566 | |
| 567 | array_pop( $wp_current_filter ); |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * Checks if any action has been registered for a hook. |
| 572 | * |
| 573 | * When using the `$callback` argument, this function may return a non-boolean value |
| 574 | * that evaluates to false (e.g. 0), so use the `===` operator for testing the return value. |