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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 |
|---|---|
| 2368 | * |
| 2369 | * Note: If using conditional tags, use the method versions within the passed instance |
| 2370 | * (e.g. $this->is_main_query() instead of is_main_query()). This is because the functions |
| 2371 | * like is_main_query() test against the global $wp_query instance, not the passed one. |
| 2372 | * |
| 2373 | * @since 2.0.0 |
| 2374 | * |
| 2375 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2376 | */ |
| 2377 | do_action_ref_array( 'pre_get_posts', array( &$this ) ); |
| 2378 | |
| 2379 | // Shorthand. |
| 2380 | $q = &$this->query_vars; |
| 2381 | |
| 2382 | // Fill again in case pre_get_posts unset some vars. |
| 2383 | $q = $this->fill_query_vars($q); |
| 2384 | |
| 2385 | // Parse meta query |
| 2386 | $this->meta_query = new WP_Meta_Query(); |