hedera-web/web/db-session-handler.php

<?php

namespace Vn\Web;

class DbSessionHandler implements \SessionHandlerInterface {
	private $db;
	
	function __construct($db) {
		$this->db = $db;
	}

	function open($savePath, $name) {
		return TRUE;
	}

	function close() {
		return TRUE;
	}

	function read($sessionId) {
		$sessionData = $this->db->getValue(
			'SELECT data FROM userSession WHERE ssid = #', [$sessionId]);
		return isset($sessionData) ? $sessionData : '';
	}

	function write($sessionId, $sessionData) {
		$this->db->query(
			'INSERT INTO userSession SET
					ssid = #, data = #, lastUpdate = NOW()
				ON DUPLICATE KEY UPDATE
					data = VALUES(data), lastUpdate = VALUES(lastUpdate)',
			[$sessionId, $sessionData]);
		return TRUE;
	}

	function destroy($sessionId) {
		$this->db->query('DELETE FROM userSession WHERE ssid = #', [$sessionId]);
		return TRUE;	
	}

	function gc($maxLifeTime) {
		$this->db->query('DELETE FROM userSession
			WHERE lastUpdate < TIMESTAMPADD(SECOND, -#, NOW())',
			[$maxLifeTime]
		);
		return TRUE;
	}
}