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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 |
|---|---|
| 662 | * |
| 663 | * Returning a non-false value from the filter will short-circuit the handling |
| 664 | * and return early. |
| 665 | * |
| 666 | * @since 4.5.0 |
| 667 | * |
| 668 | * @param bool $preempt Whether to short-circuit default header status handling. Default false. |
| 669 | * @param WP_Query $wp_query WordPress Query object. |
| 670 | */ |
| 671 | if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) { |
| 672 | return; |
| 673 | } |
| 674 | |
| 675 | // If we've already issued a 404, bail. |
| 676 | if ( is_404() ) { |
| 677 | return; |
| 678 | } |
| 679 | |
| 680 | $set_404 = true; |