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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 |
|---|---|
| 2626 | |
| 2627 | /** |
| 2628 | * Filters the JOIN clause of the query. |
| 2629 | * |
| 2630 | * @since 1.5.0 |
| 2631 | * |
| 2632 | * @param string $join The JOIN clause of the query. |
| 2633 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2634 | */ |
| 2635 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
| 2636 | } |
| 2637 | |
| 2638 | // Paging. |
| 2639 | if ( empty( $q['nopaging'] ) && ! $this->is_singular ) { |
| 2640 | $page = absint( $q['paged'] ); |
| 2641 | if ( ! $page ) { |
| 2642 | $page = 1; |
| 2643 | } |
| 2644 | |