CodeIgniter增加redis的cache driver
希望在CI中使用redis作为缓存驱动，发现官方github上已经有了:D，貌似要到3.0才正式发布，先用上吧，省事了为了保持框架可升级操作如下，
1、将system\libraries\Cache\Cache.php复制为application\libraries\Cache\Cache.php
增加配置
protected $valid_drivers = array(
'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy', 'cache_redis'
);
2、将https://github.com/EllisLab/CodeIgniter/blob/develop/system/libraries/Cache/drivers/Cache_redis.php放到application\libraries\Cache\drivers下
3、测试：
$this->load->driver('cache', array('adapter' => 'redis'));
if ( ! $foo = $this->cache->get('foo'))
{
echo 'Saving to the cache!<br />';
$foo = 'foobarbaz!';
// Save into the cache for 5 minutes
$this->cache->save('foo', $foo, 300);
}
echo $foo;
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