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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 |
|---|---|
| 3057 | * Filters the GROUP BY clause of the query. |
| 3058 | * |
| 3059 | * For use by caching plugins. |
| 3060 | * |
| 3061 | * @since 2.5.0 |
| 3062 | * |
| 3063 | * @param string $groupby The GROUP BY clause of the query. |
| 3064 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3065 | */ |
| 3066 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 3067 | |
| 3068 | /** |
| 3069 | * Filters the JOIN clause of the query. |
| 3070 | * |
| 3071 | * For use by caching plugins. |
| 3072 | * |
| 3073 | * @since 2.5.0 |
| 3074 | * |
| 3075 | * @param string $join The JOIN clause of the query. |