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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 |
|---|---|
| 721 | * |
| 722 | * Returning a non-false value from the filter will short-circuit the handling |
| 723 | * and return early. |
| 724 | * |
| 725 | * @since 4.5.0 |
| 726 | * |
| 727 | * @param bool $preempt Whether to short-circuit default header status handling. Default false. |
| 728 | * @param WP_Query $wp_query WordPress Query object. |
| 729 | */ |
| 730 | if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) { |
| 731 | return; |
| 732 | } |
| 733 | |
| 734 | // If we've already issued a 404, bail. |
| 735 | if ( is_404() ) { |
| 736 | return; |
| 737 | } |
| 738 | |
| 739 | $set_404 = true; |