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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 |
|---|---|
| 2742 | * |
| 2743 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 2744 | * fields (SELECT), and LIMITS clauses. |
| 2745 | * |
| 2746 | * @since 3.1.0 |
| 2747 | * |
| 2748 | * @param string[] $clauses Associative array of the clauses for the query. |
| 2749 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2750 | */ |
| 2751 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
| 2752 | |
| 2753 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
| 2754 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
| 2755 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
| 2756 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
| 2757 | $distinct = isset( $clauses['distinct'] ) ? $clauses['distinct'] : ''; |
| 2758 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
| 2759 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
| 2760 | } |