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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 |
|---|---|
| 2931 | * @type string $groupby The GROUP BY clause of the query. |
| 2932 | * @type string $join The JOIN clause of the query. |
| 2933 | * @type string $orderby The ORDER BY clause of the query. |
| 2934 | * @type string $distinct The DISTINCT clause of the query. |
| 2935 | * @type string $fields The SELECT clause of the query. |
| 2936 | * @type string $limits The LIMIT clause of the query. |
| 2937 | * } |
| 2938 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2939 | */ |
| 2940 | $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) ); |
| 2941 | |
| 2942 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
| 2943 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
| 2944 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
| 2945 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
| 2946 | $distinct = isset( $clauses['distinct'] ) ? $clauses['distinct'] : ''; |
| 2947 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
| 2948 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
| 2949 | } |