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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 456 | if ( is_array( $arg ) && 1 == count( $arg ) && isset( $arg[0] ) && is_object( $arg[0] ) ) { // array(&$this) |
| 457 | $args[] =& $arg[0]; |
| 458 | } else { |
| 459 | $args[] = $arg; |
| 460 | } |
| 461 | for ( $a = 2, $num = func_num_args(); $a < $num; $a++ ) { |
| 462 | $args[] = func_get_arg( $a ); |
| 463 | } |
| 464 | |
| 465 | $wp_filter[ $tag ]->do_action( $args ); |
| 466 | |
| 467 | array_pop( $wp_current_filter ); |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * Retrieve the number of times an action is fired. |
| 472 | * |
| 473 | * @since 2.1.0 |
| 474 | * |
| Line | Code |
| 522 | array_pop( $wp_current_filter ); |
| 523 | } |
| 524 | return; |
| 525 | } |
| 526 | |
| 527 | if ( ! isset( $wp_filter['all'] ) ) { |
| 528 | $wp_current_filter[] = $tag; |
| 529 | } |
| 530 | |
| 531 | $wp_filter[ $tag ]->do_action( $args ); |
| 532 | |
| 533 | array_pop( $wp_current_filter ); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * Check if any action has been registered for a hook. |
| 538 | * |
| 539 | * @since 2.5.0 |
| 540 | * |