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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 |
|---|---|
| 2573 | * |
| 2574 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
| 2575 | * fields (SELECT), and LIMITS clauses. |
| 2576 | * |
| 2577 | * @since 3.1.0 |
| 2578 | * |
| 2579 | * @param array $clauses The list of clauses for the query. |
| 2580 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2581 | */ |
| 2582 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
| 2583 | |
| 2584 | $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : ''; |
| 2585 | $groupby = isset( $clauses[ 'groupby' ] ) ? $clauses[ 'groupby' ] : ''; |
| 2586 | $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : ''; |
| 2587 | $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : ''; |
| 2588 | $distinct = isset( $clauses[ 'distinct' ] ) ? $clauses[ 'distinct' ] : ''; |
| 2589 | $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : ''; |
| 2590 | $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : ''; |
| 2591 | } |