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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 |
|---|---|
| 666 | * @type string $fields The SELECT clause of the query. |
| 667 | * @type string $join The JOIN clause of the query. |
| 668 | * @type string $where The WHERE clause of the query. |
| 669 | * @type string $orderby The ORDER BY clause of the query. |
| 670 | * @type string $limits The LIMIT clause of the query. |
| 671 | * @type string $groupby The GROUP BY clause of the query. |
| 672 | * } |
| 673 | * @param WP_Site_Query $query Current instance of WP_Site_Query (passed by reference). |
| 674 | */ |
| 675 | $clauses = apply_filters_ref_array( 'sites_clauses', array( compact( $pieces ), &$this ) ); |
| 676 | |
| 677 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
| 678 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
| 679 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
| 680 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
| 681 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
| 682 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
| 683 | |
| 684 | if ( $where ) { |