当前使用Centos7.x系统，php使用7.1版本，wlnmp一键包已支持该扩展

php7安装memcached扩展（基于Centos6.x）参考：https://blog.whsir.com/post-4845.html

memcached扩展包地址：https://pecl.php.net/package/memcached

1、安装所需依赖，如果在编译时还提示缺少其他依赖，请自行安装
yum install autoconf gcc gcc-c++ libmemcached libmemcached-devel

|---|------------------------------------------------------------------| | 1 | yum install autoconf gcc gcc-c++ libmemcached libmemcached-devel |

2、下载memcached最新稳定版
wget https://pecl.php.net/get/memcached-3.1.3.tgz tar xf memcached-3.1.3.tgz cd memcached-3.1.3 /usr/local/php/bin/phpize

|---------|---------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 | wget https://pecl.php.net/get/memcached-3.1.3.tgz tar xf memcached-3.1.3.tgz cd memcached-3.1.3 /usr/local/php/bin/phpize |

根据自己phpize的位置来运行即可（不知道phpize在哪的直接find / -name phpize查找），运行完提示下面信息，然后编译

Configuring for:
PHP Api Version: 20160303
Zend Module Api No: 20160303
Zend Extension Api No: 320160303

3、编译扩展模块
./configure --with-php-config=/usr/local/php/bin/php-config make make install

|-------|-------------------------------------------------------------------------------| | 1 2 3 | ./configure --with-php-config=/usr/local/php/bin/php-config make make install |

执行完成后会显示扩展模块编译到的目录/usr/local/php/lib/php/extensions/no-debug-non-zts-20160303/

4、修改php.ini添加扩展
extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20160303/" extension=memcached.so

|-----|-------------------------------------------------------------------------------------------------------| | 1 2 | extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20160303/" extension=memcached.so |

注意：如果之前配置过extension_dir路径了，则只需要配置extension=memcached.so即可

保存退出，重启php

通过phpinfo可看到，扩展已生效