Ubuntu 16.04 为 PHP7 添加 memcached 以及 redis 扩展
切换到 PHP 7 之后，网站的速度大幅提升，不过通常的扩展可能某一个就还没有支持 PHP7.
Memcached
比如说我现在使用了最新的 Ubuntu 16.04，虽然内置了 PHP 7 源，但 memcached 就还没有，不过好在，它已经支持了 PHP 7 ，只是没有源而已，我们手动编译它。
要安装 memcached，需要先安装依赖库 libmemcached
从 这里找到最新的 libmemcached 源码包，然后下载。
wgethttps://launchpad.net/libmemcached/1.0/1.0.18/+download/libmemcached-1.0.18.tar.gztar -zxflibmemcached-1.0.18.tar.gzcdlibmemcached-1.0.18/./configuremakemakeinstall
安装好依赖库之后，我们来安装 memcached ：
从 github 克隆 memcached 后，需要手动切换到 php7 分支，不然会提示 fatal error : ext / standard / php_smart_str . h : No such file or directory错误。
gitclone https://github.com/php-memcached-dev/php-memcached.gitcdphp-memcached/gitcheckoutphp7phpize./configure --disable-memcached-saslmakemakeinstall
Redis
同样的，Redis其实也已经有了 PHP 7 版本，我们从 github 上获取项目克隆，然后手动切换到 php7 分支即可：
gitclone https://github.com/phpredis/phpredis.gitcdphpredis/gitcheckoutphp7phpize./configuremakemakeinstall
启动扩展
光安装了还不够，我们还需要编辑PHP的配置文件来使扩展被加载才行， vi / etc / php / 7.0 / fpm / php .ini，在配置文件中添加如下语句：
extension=memcached.soextension=redis.so
最后使用命令来重启 PHP 服务： service php7 . 0 - fpm restart
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