1.由於memcached依賴於libevent，因此需要安裝libevent。由於linux系統可能默認已經安裝libevent，執行命令:
rpm -qa|grep libevent
查看系統是否帶有該安裝軟件，如果有執行命令:
rpm -e libevent-1.4.13-4.el6.x86_64 --nodeps（由於系統自帶的版本舊，忽略依賴刪除）

2、下載安裝包libevent-2.1.2-alpha.tar.gz

tar -zxvf libevent-2.1.2-alpha.tar.gz

cd libevent-2.1.2-alpha

make &&make install

3、安裝libmemcached

tar -zxvf libmemcached-1.0.18.tar.gz

./configure -prefix=/usr/local/libmemcached --with-memcached

make && make install

4、安裝memcached

tar -zxvf memched-2.0.2..tar.gz

./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent/ --with-php-config=/usr/local/odrive/php56/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/ --disable-memcached-sasl

make && make install

為php5.6安裝memched擴展