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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 |
|---|---|
| 2565 | |
| 2566 | /** |
| 2567 | * Filters the DISTINCT clause of the query. |
| 2568 | * |
| 2569 | * @since 2.1.0 |
| 2570 | * |
| 2571 | * @param string $distinct The DISTINCT clause of the query. |
| 2572 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2573 | */ |
| 2574 | $distinct = apply_filters_ref_array( 'posts_distinct', array( $distinct, &$this ) ); |
| 2575 | |
| 2576 | /** |
| 2577 | * Filters the LIMIT clause of the query. |
| 2578 | * |
| 2579 | * @since 2.1.0 |
| 2580 | * |
| 2581 | * @param string $limits The LIMIT clause of the query. |
| 2582 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2583 | */ |