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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 |
---|---|
2718 | * |
2719 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
2720 | * fields (SELECT), and LIMITS clauses. |
2721 | * |
2722 | * @since 3.1.0 |
2723 | * |
2724 | * @param string[] $clauses Associative array of the clauses for the query. |
2725 | * @param WP_Query $this The WP_Query instance (passed by reference). |
2726 | */ |
2727 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
2728 |
|
2729 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
2730 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
2731 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
2732 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
2733 | $distinct = isset( $clauses['distinct'] ) ? $clauses['distinct'] : ''; |
2734 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
2735 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
2736 | } |