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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 |
|---|---|
| 2803 | * Filters the DISTINCT clause of the query. |
| 2804 | * |
| 2805 | * For use by caching plugins. |
| 2806 | * |
| 2807 | * @since 2.5.0 |
| 2808 | * |
| 2809 | * @param string $distinct The DISTINCT clause of the query. |
| 2810 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2811 | */ |
| 2812 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
| 2813 | |
| 2814 | /** |
| 2815 | * Filters the SELECT clause of the query. |
| 2816 | * |
| 2817 | * For use by caching plugins. |
| 2818 | * |
| 2819 | * @since 2.5.0 |
| 2820 | * |
| 2821 | * @param string $fields The SELECT clause of the query. |