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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 |
|---|---|
| 2670 | * Filters the SELECT clause of the query. |
| 2671 | * |
| 2672 | * For use by caching plugins. |
| 2673 | * |
| 2674 | * @since 2.5.0 |
| 2675 | * |
| 2676 | * @param string $fields The SELECT clause of the query. |
| 2677 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2678 | */ |
| 2679 | $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) ); |
| 2680 | |
| 2681 | /** |
| 2682 | * Filters the LIMIT clause of the query. |
| 2683 | * |
| 2684 | * For use by caching plugins. |
| 2685 | * |
| 2686 | * @since 2.5.0 |
| 2687 | * |
| 2688 | * @param string $limits The LIMIT clause of the query. |