wp-includes/class-wp-user-query.php:92Fills in missing query variables with default values.
$argsstring|arrayarray public static function fill_query_vars( $args ) { $defaults = array( 'blog_id' => get_current_blog_id(), 'role' => '', 'role__in' => array(), 'role__not_in' => array(), 'capability' => '', 'capability__in' => array(), 'capability__not_in' => array(), 'meta_key' => '', 'meta_value' => '', 'meta_compare' => '', 'include' => array(), 'exclude' => array(), 'search' => '', 'search_columns' => array(), 'orderby' => 'login', 'order' => 'ASC', 'offset' => '', 'number' => '', 'paged' => 1, 'count_total' => true, 'fields' => 'all', 'who' => '', 'has_published_posts' => null, 'nicename' => '', 'nicename__in' => array(), 'nicename__not_in' => array(), 'login' => '', 'login__in' => array(), 'login__not_in' => array(), 'cache_results' => true, ); return wp_parse_args( $args, $defaults ); }Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
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src/wp-includes/class-wp-user-query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.