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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 |
|---|---|
| 1860 | |
| 1861 | /** |
| 1862 | * Filters the SQL JOIN clause for retrieving archives. |
| 1863 | * |
| 1864 | * @since 2.2.0 |
| 1865 | * |
| 1866 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
| 1867 | * @param array $r An array of default arguments. |
| 1868 | */ |
| 1869 | $join = apply_filters( 'getarchives_join', '', $r ); |
| 1870 | |
| 1871 | $output = ''; |
| 1872 | |
| 1873 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
| 1874 | |
| 1875 | $limit = $r['limit']; |
| 1876 | |
| 1877 | if ( 'monthly' == $r['type'] ) { |
| 1878 | $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"; |