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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 |
|---|---|
| 2507 | * |
| 2508 | * Note: If using conditional tags, use the method versions within the passed instance |
| 2509 | * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions |
| 2510 | * like is_main_query() test against the global $wp_query instance, not the passed one. |
| 2511 | * |
| 2512 | * @since 2.0.0 |
| 2513 | * |
| 2514 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2515 | */ |
| 2516 | do_action_ref_array( 'pre_get_posts', array( &$this ) ); |
| 2517 | |
| 2518 | // Shorthand. |
| 2519 | $q = &$this->query_vars; |
| 2520 | |
| 2521 | // Fill again in case pre_get_posts unset some vars. |
| 2522 | $q = $this->fill_query_vars($q); |
| 2523 | |
| 2524 | // Parse meta query |
| 2525 | $this->meta_query = new WP_Meta_Query(); |