Method isEnabled

/**
 * Checks if a module is enabled. A given module will only be returned
 * if it meets the following criteria: it is enabled, it is assigned to
 * the current menu item or all items, and the user meets the access level
 * requirements.
 *
 * @param   string  $module  The module name
 *
 * @return  boolean See description for conditions.
 *
 * @since   1.5
 */
public static function isEnabled($module)
{
    $result = static::getModule($module);
    return $result !== null && $result->id !== 0;
}