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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 |
---|---|
1602 | * @since 1.5.0 |
1603 | * @access public |
1604 | * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts. |
1605 | * |
1606 | * @return array List of posts. |
1607 | */ |
1608 | function &get_posts() { |
1609 | global $wpdb, $user_ID, $_wp_using_ext_object_cache; |
1610 |
|
1611 | do_action_ref_array('pre_get_posts', array(&$this)); |
1612 |
|
1613 | // Shorthand. |
1614 | $q = &$this->query_vars; |
1615 |
|
1616 | $q = $this->fill_query_vars($q); |
1617 |
|
1618 | // First let's clear some variables |
1619 | $distinct = ''; |
1620 | $whichcat = ''; |