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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 |
|---|---|
| 3552 | if ( !$q['suppress_filters'] ) { |
| 3553 | /** |
| 3554 | * Filters the completed SQL query before sending. |
| 3555 | * |
| 3556 | * @since 2.0.0 |
| 3557 | * |
| 3558 | * @param string $request The complete SQL query. |
| 3559 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3560 | */ |
| 3561 | $this->request = apply_filters_ref_array( 'posts_request', array( $this->request, &$this ) ); |
| 3562 | } |
| 3563 | |
| 3564 | /** |
| 3565 | * Filters the posts array before the query takes place. |
| 3566 | * |
| 3567 | * Return a non-null value to bypass WordPress's default post queries. |
| 3568 | * |
| 3569 | * Filtering functions that require pagination information are encouraged to set |
| 3570 | * the `found_posts` and `max_num_pages` properties of the WP_Query object, |