自动加载类文件时发生错误,类名【Memcached】,文件:【/www/wwwroot/www.wb-service.cn/core/basic/Memcached.php】

Fatal error: Uncaught Error: Class 'Memcached' not found in /www/wwwroot/www.wb-service.cn/core/cache/Memcache.php:42 Stack trace: #0 /www/wwwroot/www.wb-service.cn/core/cache/Memcache.php(93): core\cache\Memcache->conn() #1 [internal function]: core\cache\Memcache->__destruct() #2 {main} thrown in /www/wwwroot/www.wb-service.cn/core/cache/Memcache.php on line 42