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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 |
|---|---|
| 2819 | * Filters the GROUP BY clause of the query. |
| 2820 | * |
| 2821 | * For use by caching plugins. |
| 2822 | * |
| 2823 | * @since 2.5.0 |
| 2824 | * |
| 2825 | * @param string $groupby The GROUP BY clause of the query. |
| 2826 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2827 | */ |
| 2828 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 2829 | |
| 2830 | /** |
| 2831 | * Filters the JOIN clause of the query. |
| 2832 | * |
| 2833 | * For use by caching plugins. |
| 2834 | * |
| 2835 | * @since 2.5.0 |
| 2836 | * |
| 2837 | * @param string $join The JOIN clause of the query. |