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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 |
|---|---|
| 635 | * |
| 636 | * Returning a non-false value from the filter will short-circuit the handling |
| 637 | * and return early. |
| 638 | * |
| 639 | * @since 4.5.0 |
| 640 | * |
| 641 | * @param bool $preempt Whether to short-circuit default header status handling. Default false. |
| 642 | * @param WP_Query $wp_query WordPress Query object. |
| 643 | */ |
| 644 | if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) { |
| 645 | return; |
| 646 | } |
| 647 | |
| 648 | // If we've already issued a 404, bail. |
| 649 | if ( is_404() ) |
| 650 | return; |
| 651 | |
| 652 | // Never 404 for the admin, robots, or if we found posts. |
| 653 | if ( is_admin() || is_robots() || $wp_query->posts ) { |