php5memcached比php5memcache速度略快一点

php5-memcached和php5-memcache是两个php操作memcached的组件，他们是不同人开发的。

php官网都列出了他们各自的使用方法：

1. 首先，先安装下apache：

sudo apt-get update
sudo apt-get install apache2

2. 然后安装下php5：

sudo apt-get install php5 libapache2-mod-php5 php5-mcrypt

3. 接着安装memcached：

sudo apt-get install memcached

4. 接着安装php5-memcached和php5-memcache：

sudo apt-get install php5-memcache

sudo apt-get install php5-memcached

5. 最后重启下apache2：

sudo service apache2 restart

6.编辑test.php内容如下：

<?php// Initialize html' target='_blank'>values: 10000 keys of 20 bytes with 40 bytes of data$c = 10000;$values = array();for ($i=0;$i<$c;$i++) $values[sprintf('%020s',$i)]=sha1($i);echo "memcache vs memcached: $c keys";// Memcached$m = new Memcached();$m->addServer('localhost', 11211);$start = microtime(true);foreach ($values as $k => $v) $m->set($k, $v, 3600);$time = microtime(true)-$start;echo "memcached set: $time";$start = microtime(true);foreach ($values as $k => $v) $m->get($k);$time = microtime(true)-$start;echo "memcached get: $time";// Memcache$m = new Memcache();$m->addServer('localhost', 11211);$start = microtime(true);foreach ($values as $k => $v) $m->set($k, $v, 0, 3600);$time = microtime(true)-$start;echo "memcache set: $time";$start = microtime(true);foreach ($values as $k => $v) $m->get($k);$time = microtime(true)-$start;echo "memcache get: $time";?>

7. 运行http://machinename/test.php 或者 php /var/www/html/test.php

root@machinename # php /var/www/html/test.php
memcache vs memcached: 10000 keys
memcached set: 0.7015380859375
memcached get: 0.61220598220825
memcache set: 0.78830289840698
memcache get: 0.74954390525818

~
root@machinename # php /var/www/html/test2.php
memcache vs memcached: 10000 keys
memcache set: 0.78771591186523
memcache get: 0.75219798088074
memcached set: 0.69968199729919
memcached get: 0.60679888725281

参考文档：

1.http://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu

2. http://www.digitalocean.com/community/tutorials/how-to-install-and-use-memcache-on-ubuntu-14-04

3. http://www.leaseweb.com/labs/2013/03/memcache-vs-memcached-php-benchmark/

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