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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 |
|---|---|
| 1868 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
| 1869 | * |
| 1870 | * @return array List of posts. |
| 1871 | */ |
| 1872 | function &get_posts() { |
| 1873 | global $wpdb, $user_ID, $_wp_using_ext_object_cache; |
| 1874 | |
| 1875 | $this->parse_query(); |
| 1876 | |
| 1877 | do_action_ref_array('pre_get_posts', array(&$this)); |
| 1878 | |
| 1879 | // Shorthand. |
| 1880 | $q = &$this->query_vars; |
| 1881 | |
| 1882 | $q = $this->fill_query_vars($q); |
| 1883 | |
| 1884 | // First let's clear some variables |
| 1885 | $distinct = ''; |
| 1886 | $whichauthor = ''; |