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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 |
|---|---|
| 1915 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
| 1916 | * |
| 1917 | * @return array List of posts. |
| 1918 | */ |
| 1919 | function get_posts() { |
| 1920 | global $wpdb, $user_ID, $_wp_using_ext_object_cache; |
| 1921 | |
| 1922 | $this->parse_query(); |
| 1923 | |
| 1924 | do_action_ref_array('pre_get_posts', array(&$this)); |
| 1925 | |
| 1926 | // Shorthand. |
| 1927 | $q = &$this->query_vars; |
| 1928 | |
| 1929 | // Fill again in case pre_get_posts unset some vars. |
| 1930 | $q = $this->fill_query_vars($q); |
| 1931 | |
| 1932 | // Parse meta query |
| 1933 | $this->meta_query = new WP_Meta_Query(); |