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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 |
---|---|
510 | * |
511 | * The default columns include 'domain' and 'path. |
512 | * |
513 | * @since 4.6.0 |
514 | * |
515 | * @param array $search_columns Array of column names to be searched. |
516 | * @param string $search Text being searched. |
517 | * @param WP_Site_Query $this The current WP_Site_Query instance. |
518 | */ |
519 | $search_columns = apply_filters( 'site_search_columns', $search_columns, $this->query_vars['search'], $this ); |
520 |
|
521 | $this->sql_clauses['where']['search'] = $this->get_search_sql( $this->query_vars['search'], $search_columns ); |
522 | } |
523 |
|
524 | $date_query = $this->query_vars['date_query']; |
525 | if ( ! empty( $date_query ) && is_array( $date_query ) ) { |
526 | $this->date_query = new WP_Date_Query( $date_query, 'registered' ); |
527 | $this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() ); |
528 | } |