php 扩展,内含安装手册以及源码包，libevent-2.0.22，libmemcached-1.0.18，memcached-1.4.25，memcached-2.2.0，已经在CentOS6.5上进行测试通过。-PHP expansion, including the installation manual and source package, libevent-2.0.22, libmemcached-1.0.18, memcached-1.4.25, memcached-2.2.0,