WordPress at a glance
filter is not described

found_users_query filter-hook . WP 3.2.0

Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.

Usage

add_filter( 'found_users_query', 'filter_function_name_5938' );
function filter_function_name_5938( $sql ){
	// filter...

	return $sql;
}
$sql(string)
The SELECT FOUND_ROWS() query for the current WP_User_Query.

Where the hook is called

WP_User_Query::query()
wp-includes/class-wp-user-query.php 609
$this->total_users = (int) $wpdb->get_var( apply_filters( 'found_users_query', 'SELECT FOUND_ROWS()' ) );

Where the hook is used (in WP core)

Does not used.