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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 |
|---|---|
| 3093 | * Filters the DISTINCT clause of the query. |
| 3094 | * |
| 3095 | * For use by caching plugins. |
| 3096 | * |
| 3097 | * @since 2.5.0 |
| 3098 | * |
| 3099 | * @param string $distinct The DISTINCT clause of the query. |
| 3100 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3101 | */ |
| 3102 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
| 3103 | |
| 3104 | /** |
| 3105 | * Filters the SELECT clause of the query. |
| 3106 | * |
| 3107 | * For use by caching plugins. |
| 3108 | * |
| 3109 | * @since 2.5.0 |
| 3110 | * |
| 3111 | * @param string $fields The SELECT clause of the query. |