PHP framework CodeIgniter uses redis to explain the method

This article mainly introduces the method of using redis in PHP framework CodeIgniter, and analyzes the installation and settings of redis in the form of examples, as well as the related operating skills and precautions for using redis in CodeIgniter. Friends in need can refer to the following

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 on the computer ) and run, see another article for details: //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 can't 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. Okay, actually this vc14 is the 7.0 version of PHP, and what we need is the 7.1 version, so it was always wrong and I couldn’t find the problem until I found this:

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

Click on the corresponding version:

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

Download 7.1 corresponding version.

② Installation

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

is in the extension In the header of the configuration area, add the redis configuration. The installation is complete.

③ Check the configuration information

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

<?php
 echo phpinfo();
?>

Then visit http://yourdomain.com/phpinfo.php, you can see the configuration information and look for information on whether redis configuration is successful , 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;
?>

No matter This configuration file is required whether you use the framework's redis library or the following custom redis library.

In addition to configuring redis.php, the cache type we use must also be 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 the configuration should be similar to 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. Using a custom redis class library

① Rediscli_default.php

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, no other changes are needed, you can add more methods yourself. Place it under myApplication/libraries/Rediscli/drivers/

② Rediscli.php

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;
  );
 }
}

③ Call

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

④ Time

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, first of all Use redis to store, if 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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