How to use redis in php framework CodeIgniter

This article mainly introduces the method of using redis in PHP framework CodeIgniter. It has certain reference value. Now I share it with you. Friends in need can refer to it

The example in this article describes how the PHP framework CodeIgniter uses redis. Share it with everyone for your reference, the details are as follows:

1. Install redis

First of all, the redis service (redis database) must be installed and running on the computer. For details, see another article: http://www.jb51.net/article/138173.htm

2. Install phpredis

① Download

Project address: https://github.com/phpredis/phpredis (you can ignore this). It is mentioned here that the Windows version of phpredis needs to be compiled by yourself. Of course, we cannot be so reckless.

Let me talk about the detours I have taken. I downloaded it from http://windows.php.net/downloads/pecl/snaps/redis/20160319/ (you can ignore this), but I still can’t get it right. In fact, this vc14 is For the 7.0 version of PHP, what we need is the 7.1 version, so it is always wrong and we can’t find the problem until we find this:

http://pecl.php.net/package-stats.php

Click on the corresponding version:

http://pecl.php.net/package/redis/3.1.1/windows

Download the version corresponding to 7.1.

② Installation

Place the downloaded and decompressed php_redis.dll in the ext of the php interpreter. You will find that mysql and other modules are also placed here, then open php.ini and find ;extension=php_bz2.dll, add extension=php_redis.dll,

above it That is, add the redis configuration at the head of the extension's configuration area. The installation is complete.

③ View configuration information

Restart the server or computer, add a view page under the path of index.php: phpinfo.php, and add:

<?php
 echo phpinfo();
?>

Then visit http://yourdomain.com/phpinfo.php, you can see the configuration information, and look for any information indicating successful redis configuration. If so, the configuration is complete.

3. Use PHP native method to operate redis

// 原生redis类库，不需要config/redis.php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
//$redis->set('key10','xx10',20);//第三个参数是存续时间，单位是秒，如果不填则为永久
echo $redis->get('key10');

4. Configure redis.php

Create the file redis.php under myApplication/config:

<?php
defined(&#39;BASEPATH&#39;) OR exit(&#39;No direct script access allowed&#39;);
/**
 * Created by PhpStorm.
 * Date: 2017/2/9
 * Time: 13:32
 */
$config[&#39;socket_type&#39;] = &#39;tcp&#39;;
$config[&#39;host&#39;] = &#39;127.0.0.1&#39;;
$config[&#39;password&#39;] = NULL;
$config[&#39;port&#39;] = 6379;
$config[&#39;timeout&#39;] = 0;
?>

This configuration file is required whether you are using the framework's redis library or the custom redis library below.

In addition to configuring redis.php, you must also configure The cache type we use is configured in application/config/config.php. The default is like this:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

If we use redis, then we need to configure it like this:

$config['sess_driver'] = 'redis';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 0;
$config['sess_save_path'] = 'tcp://127.0.0.1:xxxx';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 600;
$config['sess_regenerate_destroy'] = TRUE;

5. Using the redis library of the CI framework

// 框架的redis库
$this->load->driver('cache');
$this->cache->redis->save('key11','xx11');//这里注意，第三个参数是时间，在自定义redis库会说明
echo $this->cache->redis->get('key11');

6. Use a custom redis class library

The custom redis class library can be copied from system/libraries/Cache/drivers/Cache_redis.php and renamed Rediscli_default.php. The class name is also changed to Rediscli_default. Other than that, no changes are needed. You can add more methods yourself. Place it under myApplication/libraries/Rediscli/drivers/

Create a Rediscli.php under myApplication/libraries/Rediscli/

<?php
defined ( &#39;BASEPATH&#39; ) or exit ( &#39;No direct script access allowed&#39; );
/**
 * Created by PhpStorm.
 * Date: 2017/2/9
 * Time: 20:00
 */
class Rediscli extends CI_Driver_Library {
 public $valid_drivers;
 public $CI;
 function __construct() {
  $this->CI = & get_instance ();
  $this->valid_drivers = array (
   &#39;default&#39;
  );
 }
}

// 自定义类，需要配置
$this->load->driver('rediscli');
if ($this->rediscli->default->is_supported())
{
 echo $this->rediscli->default->get('key2');
}

This custom redis library is the same as the framework library, so we will focus on it here.

$this->cache->redis->save('key11','xx11',1000);

This is the saved value. The third parameter is the time, which cannot be omitted. By looking at the function, you can see that the default value of this parameter is 60 seconds, not permanent, so this parameter cannot be omitted.

7. Pay attention to this situation

// 文本存储
$this->load->driver('cache',array('adapter'=>'redis','backup'=>'file'));
$this->cache->save('key5','xx5',10000);
echo $this->cache->get('key5');//xx5

The meaning of this code is to use redis to store it first, and if it is not found, use text storage. You will find that text files are stored in myApplication/cache, and each key will have one text.

Because no error is reported, you may not know where this data exists for a while.

It’s better to use this less often. After all, redis is used for faster speed.

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