Redis的客户端实际上担负了通过网络协议与Redis Server进行通信的过程，通信的过程必须遵循协议规范，让客户的调用更加符合特定语言的使用习惯。现有PHP客户端：rediska、phpredis、Predis、Redisent。这些可护短中，有纯PHP的实现方案，也有二进制版本的实现方案。
官方提供的PHP客户端列表如下：
特性比较
predis
phpredis
Rediska
易扩展
∆
∆
客户端策略和Hash算法定义
∆
∆
实现方式
纯PHP
PHP扩展（C语言）
纯PHP
测试数据（本地环境下）
18900 SET/sec using 12 bytes for both key and value
18300 GET/sec while retrieving the very same values
0.210 seconds to fetch 30000 keys using _KEYS *_.
29000 SET/sec using 12 bytes for both key and value
30000 GET/sec while retrieving the very same values
0.037 seconds to fetch 30000 keys using "KEYS *"".
测试结果（网络环境下）
3150 SET/sec using 12 bytes for both key and
3150 GET/sec while retrieving the very same
0.212 seconds to fetch 30000 keys using "KEYS *".
3300 SET/sec using 12 bytes for both key and
3300 GET/sec while retrieving the very same
0.088 seconds to fetch 30000 keys using "KEYS *".
/*---------------------- Predis ----------------------------*/
Predis
Predis是一个灵活和特性完备（PHP>5.3）的支持Redis的PHP客户端。当前版本为0.6.3，默认不支持PHP5.2。
主要特性如下：
完整的支持从1.2到2.4的Redis，并且支持当前正在开发的版本；
提供客户端实现的一致性哈希算法，支持自定义；
在单个或聚合连接中支持命令管道；（Command pipelining _disibledevent=> sudo make
sudo make install
然后修改php.ini，重启服务就可以了。
示例代码
echo 'phpredis sample:
';
error_reporting(E_ALL);
ini_set('display_errors','ON');
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->set('first_key_phpredis', 'Hello world');
);
/*------------------- Rediska -------------------------------*/
Rediska
rediska 目前还处于 beta 阶段。他的代码托管在github上，可以方便的获取。另外也提供了PEAR版本，所以获取和安装都非常方便。可以使用PEAR包安装。
本文使用的是 Mac 下的 XAMPP提供的PEAR进行安装。首先添加频道地址：
localhost:bin shiqiang$ sudo ./pear channel-discover pear.geometria-lab.net
Password:
Adding Channel "pear.geometria-lab.net" succeeded
Discovery of channel "pear.geometria-lab.net" succeeded
然后进行安装
localhost:bin shiqiang$ sudo ./pear channel-discover pear.geometria-lab.net
Password:
Adding Channel "pear.geometria-lab.net" succeeded
Discovery of channel "pear.geometria-lab.net" succeeded
localhost:bin shiqiang$ sudo ./pear install geometria-lab/Rediska-beta
Unknown remote channel: pear.zfcampus.org
Did not download optional dependencies: channel://pear.zfcampus.org/zf, use --alldeps to download automatically
geometria-lab/Rediska can optionally use package "channel://pear.zfcampus.org/zf" (recommended version 1)
downloading Rediska-0.5.6.tgz ...
Starting to download Rediska-0.5.6.tgz (116,203 bytes)
.........................done: 116,203 bytes
install ok: channel://pear.geometria-lab.net/Rediska-0.5.6
安装完成后，就可以看到本地的目录环境下已经有了Rediska的PEAR包
localhost:XAMPP shiqiang$ sudo find . -name 'Redis*'
./xamppfiles/lib/php/pear/data/Rediska
./xamppfiles/lib/php/pear/doc/Rediska
./xamppfiles/lib/php/pear/Rediska
./xamppfiles/lib/php/pear/Rediska/Options/RediskaInstance.php
./xamppfiles/lib/php/pear/Rediska/Zend/Application/Resource/Rediska.php
./xamppfiles/lib/php/pear/Rediska/Zend/Auth/Adapter/Redis.php
./xamppfiles/lib/php/pear/Rediska/Zend/Cache/Backend/Redis.php
./xamppfiles/lib/php/pear/Rediska/Zend/Log/Writer/Redis.php
./xamppfiles/lib/php/pear/Rediska/Zend/Queue/Adapter/Redis.php
./xamppfiles/lib/php/pear/Rediska/Zend/Session/SaveHandler/Redis.php
./xamppfiles/lib/php/pear/Rediska.php
./xamppfiles/lib/php/pear/test/Rediska
./xamppfiles/lib/php/pear/test/Rediska/tests/library/Rediska
./xamppfiles/lib/php/pear/test/Rediska/tests/library/Rediska/Options/RediskaInstanceTest.php
./xamppfiles/lib/php/pear/test/Rediska/tests/library/RediskaTest.php
./xamppfiles/temp/pear/download/Rediska-0.5.6
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Options/RediskaInstance.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Application/Resource/Rediska.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Auth/Adapter/Redis.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Cache/Backend/Redis.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Log/Writer/Redis.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Queue/Adapter/Redis.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska/Zend/Session/SaveHandler/Redis.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/library/Rediska.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/tests/library/Rediska
./xamppfiles/temp/pear/download/Rediska-0.5.6/tests/library/Rediska/Options/RediskaInstanceTest.php
./xamppfiles/temp/pear/download/Rediska-0.5.6/tests/library/RediskaTest.php
./xamppfiles/temp/pear/download/Rediska-0.5.6.tgz
简单使用的示例
error_reporting(E_ALL);
ini_set('display_errors','ON');
$options = array(
'namespace' => 'Application_',
'servers' => array(
array('host' => '127.0.0.1', 'port' => 6379),
array('host' => '127.0.0.1', 'port' => 6380)
)
);
require_once 'Rediska.php';
$rediska = new Rediska($options);//创建Rediska对象，连接服务器
$key = new Rediska_Key('first_key');
$key->setValue('first_value');
$get_value = new Rediska_Key('first_key');
print $get_value;//取回存储的值
相对于Memcache的区别
1、支持的数据类型多样化。支持字符串、列表、集合、有序集合、Hash数组这几种数据类型。
2、可以灵活的指定key存储在哪台服务器上。
参考资料：
1、http://rediska.geometria-lab.net/
2、Reids Which PHP Module to use
3、PHP Redis
4、膜拜Redis
5、redis客户端 predis与phpredis 比较
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