PHP致命错误:未找到类'Memcached'

php -v:

PHP 5.5.10-1+deb.sury.org~precise+1 (cli) (built: Mar 27 2014 16:18:01) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with XCache v3.1.0, Copyright (c) 2005-2013, by mOo
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
    with XCache Optimizer v3.1.0, Copyright (c) 2005-2013, by mOo
    with XCache Cacher v3.1.0, Copyright (c) 2005-2013, by mOo
    with XCache Coverager v3.1.0, Copyright (c) 2005-2013, by mOo

dpkg -l | grep php5

结果

rc  php5-memcache                                   3.0.6-1                                             memcache extension module for PHP5
rc  php5-memcached                                  1.0.2-2                                             memcached extension module for PHP5, uses libmemcached
ii  php5-mysql                                      5.5.10+dfsg-1+deb.sury.org~precise+1                MySQL module for php5

php.ini设置.

;;;;;;;;;;;;;;;;;;;;;;;;;
;;   memchached        ;;
;;;;;;;;;;;;;;;;;;;;;;;;;

extension=/usr/lib/php5/20090626/memcache.so
extension=memcached.so
memcache.hash_strategy="consistent"

但phpinfo没有显示memchache细节.和PHP脚本给PHP Fatal error: Class 'Memcached' not found in

php5-memcache并php5-memcached没有安装.将"rc"在dpkg的输出手段,该包已被卸载,并且配置一直保持.