PHP使用Redis实现Session共享的实现示例

Redis  /  管理员 发布于 5年前   224

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 = redissession.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

";$_SESSION['usertest'.rand(1,5)]=1;var_dump($_SESSION);echo "

";

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  # >= php5.4session_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):

 * * 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  */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。

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