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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 |
|---|---|
| 541 | * The default columns depend on the search term, and include 'ID', 'user_login', |
| 542 | * 'user_email', 'user_url', 'user_nicename', and 'display_name'. |
| 543 | * |
| 544 | * @since 3.6.0 |
| 545 | * |
| 546 | * @param string[] $search_columns Array of column names to be searched. |
| 547 | * @param string $search Text being searched. |
| 548 | * @param WP_User_Query $this The current WP_User_Query instance. |
| 549 | */ |
| 550 | $search_columns = apply_filters( 'user_search_columns', $search_columns, $search, $this ); |
| 551 | |
| 552 | $this->query_where .= $this->get_search_sql( $search, $search_columns, $wild ); |
| 553 | } |
| 554 | |
| 555 | if ( ! empty( $include ) ) { |
| 556 | // Sanitized earlier. |
| 557 | $ids = implode( ',', $include ); |
| 558 | $this->query_where .= " AND $wpdb->users.ID IN ($ids)"; |
| 559 | } elseif ( ! empty( $qv['exclude'] ) ) { |