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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 |
|---|---|
| 2893 | if ( ! $q['suppress_filters'] ) { |
| 2894 | /** |
| 2895 | * Filters the completed SQL query before sending. |
| 2896 | * |
| 2897 | * @since 2.0.0 |
| 2898 | * |
| 2899 | * @param string $request The complete SQL query. |
| 2900 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2901 | */ |
| 2902 | $this->request = apply_filters_ref_array( 'posts_request', array( $this->request, &$this ) ); |
| 2903 | } |
| 2904 | |
| 2905 | /** |
| 2906 | * Filters the posts array before the query takes place. |
| 2907 | * |
| 2908 | * Return a non-null value to bypass WordPress's default post queries. |
| 2909 | * |
| 2910 | * Filtering functions that require pagination information are encouraged to set |
| 2911 | * the `found_posts` and `max_num_pages` properties of the WP_Query object, |