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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 |
|---|---|
| 3345 | * Filter the DISTINCT clause of the query. |
| 3346 | * |
| 3347 | * For use by caching plugins. |
| 3348 | * |
| 3349 | * @since 2.5.0 |
| 3350 | * |
| 3351 | * @param string $distinct The DISTINCT clause of the query. |
| 3352 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3353 | */ |
| 3354 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
| 3355 | |
| 3356 | /** |
| 3357 | * Filter the SELECT clause of the query. |
| 3358 | * |
| 3359 | * For use by caching plugins. |
| 3360 | * |
| 3361 | * @since 2.5.0 |
| 3362 | * |
| 3363 | * @param string $fields The SELECT clause of the query. |