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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 |
|---|---|
| 1997 | |
| 1998 | /** |
| 1999 | * Filters the SQL JOIN clause for retrieving archives. |
| 2000 | * |
| 2001 | * @since 2.2.0 |
| 2002 | * |
| 2003 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
| 2004 | * @param array $parsed_args An array of default arguments. |
| 2005 | */ |
| 2006 | $join = apply_filters( 'getarchives_join', '', $parsed_args ); |
| 2007 | |
| 2008 | $output = ''; |
| 2009 | |
| 2010 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 2011 | |
| 2012 | $limit = $parsed_args['limit']; |
| 2013 | |
| 2014 | if ( 'monthly' === $parsed_args['type'] ) { |
| 2015 | $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"; |