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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 |
|---|---|
| 2697 | * |
| 2698 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 2699 | * fields (SELECT), and LIMITS clauses. |
| 2700 | * |
| 2701 | * @since 3.1.0 |
| 2702 | * |
| 2703 | * @param array $pieces The pieces of the query. |
| 2704 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2705 | */ |
| 2706 | $clauses = (array) apply_filters_ref_array( 'posts_clauses_request', array( compact( $pieces ), &$this ) ); |
| 2707 | |
| 2708 | $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : ''; |
| 2709 | $groupby = isset( $clauses[ 'groupby' ] ) ? $clauses[ 'groupby' ] : ''; |
| 2710 | $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : ''; |
| 2711 | $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : ''; |
| 2712 | $distinct = isset( $clauses[ 'distinct' ] ) ? $clauses[ 'distinct' ] : ''; |
| 2713 | $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : ''; |
| 2714 | $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : ''; |
| 2715 | } |