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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 |
|---|---|
| 2557 | |
| 2558 | /** |
| 2559 | * Filters the JOIN clause of the query. |
| 2560 | * |
| 2561 | * @since 1.5.0 |
| 2562 | * |
| 2563 | * @param string $join The JOIN clause of the query. |
| 2564 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2565 | */ |
| 2566 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
| 2567 | } |
| 2568 | |
| 2569 | // Paging. |
| 2570 | if ( empty( $q['nopaging'] ) && ! $this->is_singular ) { |
| 2571 | $page = absint( $q['paged'] ); |
| 2572 | if ( ! $page ) { |
| 2573 | $page = 1; |
| 2574 | } |
| 2575 | |