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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 |
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529 |
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530 | /** |
531 | * Filters the site query clauses. |
532 | * |
533 | * @since 4.6.0 |
534 | * |
535 | * @param array $pieces A compacted array of site query clauses. |
536 | * @param WP_Site_Query $this Current instance of WP_Site_Query (passed by reference). |
537 | */ |
538 | $clauses = apply_filters_ref_array( 'sites_clauses', array( compact( $pieces ), &$this ) ); |
539 |
|
540 | $fields = isset( $clauses['fields'] ) ? $clauses['fields'] : ''; |
541 | $join = isset( $clauses['join'] ) ? $clauses['join'] : ''; |
542 | $where = isset( $clauses['where'] ) ? $clauses['where'] : ''; |
543 | $orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : ''; |
544 | $limits = isset( $clauses['limits'] ) ? $clauses['limits'] : ''; |
545 | $groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : ''; |
546 |
|
547 | if ( $where ) { |