PHP使用Redis实现Session共享的实现示例

前言

小型web服务, ssion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ssion, 确保每个服务都能共享到同一份ssion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ssion配置实现

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

测试代码

<?phpini_t("ssion.save_handler", "redis");ini_t("ssion.save_path", "tcp://127.0.0.1:6379");ssion_start();echo "<pre>";$_ssion['urtest'.rand(1,5)]=1;var_dump($_ssion);echo "</pre>";

输出 ↓

array(2) {
[“urtest1”]=>
int(88)
[“urtest3”]=>
int(1)
}
urtest1|i:1;urtest3|i:1;

评价

2. 设置用户自定义会话存储函数

通过 函数设置用户自定义会话函数.

ssion_t_save_handler ( callable $open , callable $clo , callable $read , callable $write , callable $destroy , callable $gc [, callable $create_sid [, callable $validate_sid [, callable $update_timestamp ]]] ) : bool  # >= php5.4ssion_t_save_handler ( object $ssionhandler [, bool $register_shutdown = true ] ) : bool

在配置完会话存储函数后, 再执行 ssion_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 licen information, plea view the licen * file that was distributed with this source code. */namespace symfony\手抄报清明节component\httpfoundation\ssion\storage\handler;/** * memcachessionhandler. * * @author drak <drak@zikula.org> */class memcachessionhandler implements \ssionhandlerinterface{  /**   * @var \memcache memcache driver.   */  private $memcache;  /**   * @var int time to live in conds   */  private $ttl;  /**   * @var string key prefix for shared environments.   */  private $prefix;  /**   * constructor.   *   * list of available options:   * * prefix: the prefix to u for the memcache keys in order to avoid collision   * * expiretime: the time to live in conds   *   * @param \memcache $memcache a \memcache instance   * @param array   $options an associative array of memcache options   *   * @throws \invalidargumentexception when unsupported options are pasd   */  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"', i贝加尔湖畔 好声音mplode(', ', $diff)      ));    }    $this->memcache = $memcache;    $this->ttl = ist($options['ee过去分词xpiretime']) ? (int) $options['expiretime'] : 86400;    $this->prefix = ist($options['prefix']) ? $options['prefix'] : 'sf2s';  }  /**   * {@inheritdoc}   */  public function open($savepath, $ssionname)  {    return true;  }  /**   * {@inheritdoc}   */  public funct宸宫 沐非ion clo()  {    return $this->memcache->clo();  }  /**   * {@inheritdoc}   */  public function read($ssionid)  {    return $this->memcache->get($this->prefix.$ssionid) ?: '';  }  /**   * {@inheritdoc}   */  public function write($ssionid, $data)  {    return $this->memcache->t($this->prefix.$ssionid, $data, 0, time() + $this->ttl);  }  /**   * {@inheritdoc}   */  public function destroy($ssionid)  {    return $this->me励志书籍排行榜mcache->delete($this->prefix.$ssionid);  }  /**   * {@inheritdoc}   */  public function gc($maxlifetime)  {    // not required here becau memcache will auto expire the records anyhow.    return true;  }  /**   * return a memcache instance   *   * @return \memcache   */  protected function getmemcache()  {    return $this->memcache;  }}

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