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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 |
|---|---|
| 3006 | if ( ! $q['suppress_filters'] ) { |
| 3007 | /** |
| 3008 | * Filters the completed SQL query before sending. |
| 3009 | * |
| 3010 | * @since 2.0.0 |
| 3011 | * |
| 3012 | * @param string $request The complete SQL query. |
| 3013 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3014 | */ |
| 3015 | $this->request = apply_filters_ref_array( 'posts_request', array( $this->request, &$this ) ); |
| 3016 | } |
| 3017 | |
| 3018 | /** |
| 3019 | * Filters the posts array before the query takes place. |
| 3020 | * |
| 3021 | * Return a non-null value to bypass WordPress' default post queries. |
| 3022 | * |
| 3023 | * Filtering functions that require pagination information are encouraged to set |
| 3024 | * the `found_posts` and `max_num_pages` properties of the WP_Query object, |