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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 |
|---|---|
| 513 | |
| 514 | /** |
| 515 | * Filters the site query clauses. |
| 516 | * |
| 517 | * @since 4.6.0 |
| 518 | * |
| 519 | * @param array $pieces A compacted array of site query clauses. |
| 520 | * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference. |
| 521 | */ |
| 522 | $clauses = apply_filters_ref_array( 'sites_clauses', array( compact( $pieces ), &$this ) ); |
| 523 | |
| 524 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
| 525 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
| 526 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
| 527 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
| 528 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
| 529 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
| 530 | |
| 531 | if ( $where ) { |