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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 |
|---|---|
| 2659 | if ( ! $q['suppress_filters'] ) { |
| 2660 | /** |
| 2661 | * Filters the WHERE clause of the query. |
| 2662 | * |
| 2663 | * @since 1.5.0 |
| 2664 | * |
| 2665 | * @param string $where The WHERE clause of the query. |
| 2666 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2667 | */ |
| 2668 | $where = apply_filters_ref_array( 'posts_where', array( $where, &$this ) ); |
| 2669 | |
| 2670 | /** |
| 2671 | * Filters the JOIN clause of the query. |
| 2672 | * |
| 2673 | * @since 1.5.0 |
| 2674 | * |
| 2675 | * @param string $join The JOIN clause of the query. |
| 2676 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2677 | */ |