1、因?yàn)閜hp_memcached是依賴libmemcached庫，所以首先安裝libmemcached庫，需要安裝libmemcached-1.x以上版本

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wget https://launchpad.net/libmemcached/1.0/1.0.16/+download/libmemcached-1.0.16.tar.gz

tar -zxvf libmemcached-1.0.16.tar.gz

cd libmemcached-1.0.16

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

make && make install

2.安裝擴(kuò)展，這里我們使用php自帶的pecl命令來安裝php擴(kuò)展。

/usr/local/webserver/php/bin/pecl install memcached

WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update

downloading memcached-2.2.0.tgz ...

Starting to download memcached-2.2.0.tgz (70,449 bytes)

.................done: 70,449 bytes

15 source files, building

running: phpize

Configuring for:

PHP Api Version:         20121113

Zend Module Api No:      20121212

Zend Extension Api No:   220121212

libmemcached directory [no] : /usr/local/libmemcached

building in /tmp/pear/temp/pear-build-rootjTskoD/memcached-2.2.0

running: /tmp/pear/temp/memcached/configure --with-libmemcached-dir=/usr/local/libmemcached

...............................

...............................

3、安裝完成后在配置文件添加

vim /usr/local/webserver/php/etc/php.ini

extension=memcached.so

4.重啟web服務(wù)器

service nginx  restart

5.重啟php

service php-fpm restart

6.驗(yàn)證

php -m|grep memcache

memcache

memcached