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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 |
|---|---|
| 1556 | * @since 1.5.0 |
| 1557 | * @access public |
| 1558 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
| 1559 | * |
| 1560 | * @return array List of posts. |
| 1561 | */ |
| 1562 | function &get_posts() { |
| 1563 | global $wpdb, $user_ID; |
| 1564 | |
| 1565 | do_action_ref_array('pre_get_posts', array(&$this)); |
| 1566 | |
| 1567 | // Shorthand. |
| 1568 | $q = &$this->query_vars; |
| 1569 | |
| 1570 | $q = $this->fill_query_vars($q); |
| 1571 | |
| 1572 | // First let's clear some variables |
| 1573 | $distinct = ''; |
| 1574 | $whichcat = ''; |