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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 |
|---|---|
| 1688 | |
| 1689 | /** |
| 1690 | * Filters the SQL JOIN clause for retrieving archives. |
| 1691 | * |
| 1692 | * @since 2.2.0 |
| 1693 | * |
| 1694 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
| 1695 | * @param array $r An array of default arguments. |
| 1696 | */ |
| 1697 | $join = apply_filters( 'getarchives_join', '', $r ); |
| 1698 | |
| 1699 | $output = ''; |
| 1700 | |
| 1701 | $last_changed = wp_cache_get( 'last_changed', 'posts' ); |
| 1702 | if ( ! $last_changed ) { |
| 1703 | $last_changed = microtime(); |
| 1704 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
| 1705 | } |
| 1706 | |