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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.
| Line | Code |
|---|---|
| 673 | * |
| 674 | * Returning a non-false value from the filter will short-circuit the handling |
| 675 | * and return early. |
| 676 | * |
| 677 | * @since 4.5.0 |
| 678 | * |
| 679 | * @param bool $preempt Whether to short-circuit default header status handling. Default false. |
| 680 | * @param WP_Query $wp_query WordPress Query object. |
| 681 | */ |
| 682 | if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) { |
| 683 | return; |
| 684 | } |
| 685 | |
| 686 | // If we've already issued a 404, bail. |
| 687 | if ( is_404() ) { |
| 688 | return; |
| 689 | } |
| 690 | |
| 691 | $set_404 = true; |