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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 |
|---|---|
| 2929 | * Filters the WHERE clause of the query. |
| 2930 | * |
| 2931 | * For use by caching plugins. |
| 2932 | * |
| 2933 | * @since 2.5.0 |
| 2934 | * |
| 2935 | * @param string $where The WHERE clause of the query. |
| 2936 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2937 | */ |
| 2938 | $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) ); |
| 2939 | |
| 2940 | /** |
| 2941 | * Filters the GROUP BY clause of the query. |
| 2942 | * |
| 2943 | * For use by caching plugins. |
| 2944 | * |
| 2945 | * @since 2.5.0 |
| 2946 | * |
| 2947 | * @param string $groupby The GROUP BY clause of the query. |