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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 |
|---|---|
| 1595 | |
| 1596 | /** |
| 1597 | * Filter the SQL JOIN clause for retrieving archives. |
| 1598 | * |
| 1599 | * @since 2.2.0 |
| 1600 | * |
| 1601 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
| 1602 | * @param array $r An array of default arguments. |
| 1603 | */ |
| 1604 | $join = apply_filters( 'getarchives_join', '', $r ); |
| 1605 | |
| 1606 | $output = ''; |
| 1607 | |
| 1608 | $last_changed = wp_cache_get( 'last_changed', 'posts' ); |
| 1609 | if ( ! $last_changed ) { |
| 1610 | $last_changed = microtime(); |
| 1611 | wp_cache_set( 'last_changed', $last_changed, 'posts' ); |
| 1612 | } |
| 1613 | |