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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 |
|---|---|
| 2881 | * |
| 2882 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 2883 | * fields (SELECT), and LIMITS clauses. |
| 2884 | * |
| 2885 | * @since 3.1.0 |
| 2886 | * |
| 2887 | * @param string[] $pieces Associative array of the pieces of the query. |
| 2888 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2889 | */ |
| 2890 | $clauses = (array) apply_filters_ref_array( 'posts_clauses_request', array( compact( $pieces ), &$this ) ); |
| 2891 | |
| 2892 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
| 2893 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
| 2894 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
| 2895 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
| 2896 | $distinct = isset( $clauses['distinct'] ) ? $clauses['distinct'] : ''; |
| 2897 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
| 2898 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
| 2899 | } |