PHP使用Redis实现Session共享

栏目: PHP · 发布时间: 5年前

内容简介:Last-Modified: 2019年5月10日16:06:36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.

Last-Modified: 2019年5月10日16:06:36

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

<?php
ini_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.
 */

namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;

/**
 * MemcacheSessionHandler.
 *
 * @author Drak <drak@zikula.org>
 */
class MemcacheSessionHandler implements \SessionHandlerInterface
{
    /**
     * @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
     */
    public function __construct(\Memcache $memcache, array $options = array())
    {
        if ($diff = array_diff(array_keys($options), array('prefix', 'expiretime'))) {
            throw new \InvalidArgumentException(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}
     */
    public function open($savePath, $sessionName)
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function close()
    {
        return $this->memcache->close();
    }

    /**
     * {@inheritdoc}
     */
    public function read($sessionId)
    {
        return $this->memcache->get($this->prefix.$sessionId) ?: '';
    }

    /**
     * {@inheritdoc}
     */
    public function write($sessionId, $data)
    {
        return $this->memcache->set($this->prefix.$sessionId, $data, 0, time() + $this->ttl);
    }

    /**
     * {@inheritdoc}
     */
    public function destroy($sessionId)
    {
        return $this->memcache->delete($this->prefix.$sessionId);
    }

    /**
     * {@inheritdoc}
     */
    public function gc($maxlifetime)
    {
        // not required here because memcache will auto expire the records anyhow.
        return true;
    }

    /**
     * Return a Memcache instance
     *
     * @return \Memcache
     */
    protected function getMemcache()
    {
        return $this->memcache;
    }
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络,本站转载出于传递更多信息之目的,版权归原作者或者来源机构所有,如转载稿涉及版权问题,请联系我们

An Introduction to Probability Theory and Its Applications

An Introduction to Probability Theory and Its Applications

William Feller / Wiley / 1991-1-1 / USD 120.00

Major changes in this edition include the substitution of probabilistic arguments for combinatorial artifices, and the addition of new sections on branching processes, Markov chains, and the De Moivre......一起来看看 《An Introduction to Probability Theory and Its Applications》 这本书的介绍吧!

HTML 压缩/解压工具
HTML 压缩/解压工具

在线压缩/解压 HTML 代码

HTML 编码/解码
HTML 编码/解码

HTML 编码/解码

HSV CMYK 转换工具
HSV CMYK 转换工具

HSV CMYK互换工具