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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 |
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1902 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
1903 | * |
1904 | * @return array List of posts. |
1905 | */ |
1906 | function &get_posts() { |
1907 | global $wpdb, $user_ID, $_wp_using_ext_object_cache; |
1908 |
|
1909 | $this->parse_query(); |
1910 |
|
1911 | do_action_ref_array('pre_get_posts', array(&$this)); |
1912 |
|
1913 | // Shorthand. |
1914 | $q = &$this->query_vars; |
1915 |
|
1916 | // Fill again in case pre_get_posts unset some vars. |
1917 | $q = $this->fill_query_vars($q); |
1918 |
|
1919 | // Parse meta query |
1920 | $this->meta_query = new WP_Meta_Query(); |