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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 |
|---|---|
| 488 | * |
| 489 | * The default columns include 'domain' and 'path. |
| 490 | * |
| 491 | * @since 4.6.0 |
| 492 | * |
| 493 | * @param array $search_columns Array of column names to be searched. |
| 494 | * @param string $search Text being searched. |
| 495 | * @param WP_Site_Query $this The current WP_Site_Query instance. |
| 496 | */ |
| 497 | $search_columns = apply_filters( 'site_search_columns', $search_columns, $this->query_vars['search'], $this ); |
| 498 | |
| 499 | $this->sql_clauses['where']['search'] = $this->get_search_sql( $this->query_vars['search'], $search_columns ); |
| 500 | } |
| 501 | |
| 502 | $date_query = $this->query_vars['date_query']; |
| 503 | if ( ! empty( $date_query ) && is_array( $date_query ) ) { |
| 504 | $this->date_query = new WP_Date_Query( $date_query, 'registered' ); |
| 505 | $this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() ); |
| 506 | } |