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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 |
|---|---|
| 2968 | * Filters the WHERE clause of the query. |
| 2969 | * |
| 2970 | * For use by caching plugins. |
| 2971 | * |
| 2972 | * @since 2.5.0 |
| 2973 | * |
| 2974 | * @param string $where The WHERE clause of the query. |
| 2975 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2976 | */ |
| 2977 | $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) ); |
| 2978 | |
| 2979 | /** |
| 2980 | * Filters the GROUP BY clause of the query. |
| 2981 | * |
| 2982 | * For use by caching plugins. |
| 2983 | * |
| 2984 | * @since 2.5.0 |
| 2985 | * |
| 2986 | * @param string $groupby The GROUP BY clause of the query. |