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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 |
---|---|
1725 |
|
1726 | /** |
1727 | * Filters the SQL JOIN clause for retrieving archives. |
1728 | * |
1729 | * @since 2.2.0 |
1730 | * |
1731 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
1732 | * @param array $r An array of default arguments. |
1733 | */ |
1734 | $join = apply_filters( 'getarchives_join', '', $r ); |
1735 |
|
1736 | $output = ''; |
1737 |
|
1738 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
1739 |
|
1740 | $limit = $r['limit']; |
1741 |
|
1742 | if ( 'monthly' == $r['type'] ) { |
1743 | $query = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date $order $limit"; |