PHP使用Redis实现Session共享

  • Z时代
  • 2024-01-10
  • 分类：综合

编程

前言

小型web服务, session数据基本是保存在本地(更多是本地磁盘文件), 但是当部署多台服务, 且需要共享session, 确保每个服务都能共享到同一份session数据.

redis 数据存储在内存中, 性能好, 配合持久化可确保数据完整。 

设计方案

1.通过php自身session配置实现

# 使用 redis 作为存储方案 session.save_handler = redis session.save_path = "tcp://127.0.0.1:6379" # 若设置了连接密码, 则使用如下 session.save_path = "tcp://127.0.0.1:6379?auth=密码"

测试代码

<?phpini_set("session.save_handler","redis");ini_set("session.save_path","tcp://127.0.0.1:6379");session_start();echo"<pre>";$_SESSION["usertest".rand(1,5)]=1;var_dump($_SESSION);echo"</pre>";

输出 ↓

array(2) { ["usertest1"]=> int(88) ["usertest3"]=> int(1) } usertest1|i:1;usertest3|i:1;

评价

优点: 实现简单, 无需修改php代码

缺点: 配置不支持多样化, 只能应用于简单场景

2. 设置用户自定义会话存储函数

通过 session_set_save_handler() 函数设置用户自定义会话函数。

session_set_save_handler ( callable $open , callable $close , callable $read , callable $write , callable $destroy , callable $gc [, callable $create_sid [, callable $validate_sid [, callable $update_timestamp ]]] ) : bool # >= php5.4 session_set_save_handler ( object $sessionhandler [, bool $register_shutdown = TRUE ] ) : bool

在配置完会话存储函数后, 再执行 session_start() 即可。

具体代码略, 以下提供一份 Memcached 的(来自Symfony框架代码)：

<?php/*  * This file is part of the Symfony package.  *  * (c) Fabien Potencier <fabien@symfony.com>  *  * For the full copyright and license information, please view the LICENSE  * file that was distributed with this source code.  */namespaceSymfonyComponentHttpFoundationSessionStorageHandler;/**  * MemcacheSessionHandler.  *  * @author Drak <drak@zikula.org>  */classMemcacheSessionHandlerimplementsSessionHandlerInterface{/**  * @var Memcache Memcache driver.  */private$memcache;/**  * @var int Time to live in seconds  */private$ttl;/**  * @var string Key prefix for shared environments.  */private$prefix;/**  * Constructor.  *  * List of available options:  * * prefix: The prefix to use for the memcache keys in order to avoid collision  * * expiretime: The time to live in seconds  *  * @param Memcache $memcache A Memcache instance  * @param array $options An associative array of Memcache options  *  * @throws InvalidArgumentException When unsupported options are passed  */publicfunction__construct(Memcache$memcache,array$options=array()){if($diff=array_diff(array_keys($options),array("prefix","expiretime"))){thrownewInvalidArgumentException(sprintf("The following options are not supported "%s"",implode(", ",$diff)));}$this->memcache=$memcache;$this->ttl=isset($options["expiretime"])?(int)$options["expiretime"]:86400;$this->prefix=isset($options["prefix"])?$options["prefix"]:"sf2s";}/**  * {@inheritdoc}  */publicfunctionopen($savePath,$sessionName){returntrue;}/**  * {@inheritdoc}  */publicfunctionclose(){return$this->memcache->close();}/**  * {@inheritdoc}  */publicfunctionread($sessionId){return$this->memcache->get($this->prefix.$sessionId)?:"";}/**  * {@inheritdoc}  */publicfunctionwrite($sessionId,$data){return$this->memcache->set($this->prefix.$sessionId,$data,0,time()+$this->ttl);}/**  * {@inheritdoc}  */publicfunctiondestroy($sessionId){return$this->memcache->delete($this->prefix.$sessionId);}/**  * {@inheritdoc}  */publicfunctiongc($maxlifetime){// not required here because memcache will auto expire the records anyhow. returntrue;}/**  * Return a Memcache instance  *  * @return Memcache  */protectedfunctiongetMemcache(){return$this->memcache;}}

 

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