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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 |
|---|---|
| 2604 | $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) ); |
| 2605 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 2606 | $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) ); |
| 2607 | $orderby = apply_filters_ref_array( 'posts_orderby_request', array( $orderby, &$this ) ); |
| 2608 | $distinct = apply_filters_ref_array( 'posts_distinct_request', array( $distinct, &$this ) ); |
| 2609 | $fields = apply_filters_ref_array( 'posts_fields_request', array( $fields, &$this ) ); |
| 2610 | $limits = apply_filters_ref_array( 'post_limits_request', array( $limits, &$this ) ); |
| 2611 | |
| 2612 | // Filter all clauses at once, for convenience |
| 2613 | $clauses = (array) apply_filters_ref_array( 'posts_clauses_request', array( compact( $pieces ), &$this ) ); |
| 2614 | foreach ( $pieces as $piece ) |
| 2615 | $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : ''; |
| 2616 | } |
| 2617 | |
| 2618 | if ( ! empty($groupby) ) |
| 2619 | $groupby = 'GROUP BY ' . $groupby; |
| 2620 | if ( !empty( $orderby ) ) |
| 2621 | $orderby = 'ORDER BY ' . $orderby; |
| 2622 | |