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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 |
---|---|
3351 | * Filter the DISTINCT clause of the query. |
3352 | * |
3353 | * For use by caching plugins. |
3354 | * |
3355 | * @since 2.5.0 |
3356 | * |
3357 | * @param string $distinct The DISTINCT clause of the query. |
3358 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
3359 | */ |
3360 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
3361 |
|
3362 | /** |
3363 | * Filter the SELECT clause of the query. |
3364 | * |
3365 | * For use by caching plugins. |
3366 | * |
3367 | * @since 2.5.0 |
3368 | * |
3369 | * @param string $fields The SELECT clause of the query. |