php-memcached extension installation

# wget https://launchpadlibrarian.net/165454254/libmemcached-1.0.18.tar.gz
# tar -zxvf libmemcached-1.0.18.tar.gz
# cd libmemcached-1.0.18
# ./configure --prefix=/usr/local/libmemcached --with-memcached
# make && make install

# wget https://pecl.php.net/get/memcached-3.0.4.tgz
# mv memcached-3.0.4.tgz php-memcached-3.0.4.tgz
# tar -zxvf php-memcached-3.0.4.tgz
# mv memcached-3.0.4 php-memcached-3.0.4
# cd php-memcached-3.0.4
# /usr/local/php/bin/phpize
# ./configure --with-php-config=/usr/local/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached/ --disable-memcached-sasl
# make && make install

修改php.ini文件

添加一行：
[memcached]
extension = memcached.so
重启php-fpm：kill -USR2 `cat /usr/local/php/var/run/php-fpm.pid`

$m = new Memcached();
$m->addServer('127.0.0.1','11211');
print_r($m->getStats());