摘要：年月日前言小型服務數據基本是保存在本地更多是本地磁盤文件但是當部署多臺服務且需要共享確保每個服務都能共享到同一份數據數據存儲在內存中性能好配合持久化可確保數據完整設計方案通過自身配置實現使用作為存儲方案若設置了連接密碼則使用如下密碼測試代

Last-Modified: 2019年5月10日16:06:36

小型web服務, session數據基本是保存在本地(更多是本地磁盤文件), 但是當部署多臺服務, 且需要共享session, 確保每個服務都能共享到同一份session數據.

redis 數據存儲在內存中, 性能好, 配合持久化可確保數據完整.

# 使用 redis 作為存儲方案
session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"
# 若設置了連接密碼, 則使用如下
session.save_path = "tcp://127.0.0.1:6379?auth=密碼"

測試代碼

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

echo "

輸出 ↓

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

評價

優點: 實現簡單, 無需修改php代碼

缺點: 配置不支持多樣化, 只能應用于簡單場景

通過 session_set_save_handler() 函數設置用戶自定義會話函數.

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

在配置完會話存儲函數后, 再執行 session_start() 即可.

具體代碼略, 以下提供一份 Memcached 的(來自Symfony框架代碼):

 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SymfonyComponentHttpFoundationSessionStorageHandler;

/**
 * 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;
    }
}