Store PHP sessions in the database

app/Core/Session/SessionHandler.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Kanboard\Core\Session;
+
+use PicoDb\Database;
+use SessionHandlerInterface;
+
+/**
+ * Class SessionHandler
+ *
+ * @package Kanboard\Core\Session
+ */
+class SessionHandler implements SessionHandlerInterface
+{
+    const TABLE = 'sessions';
+
+    /**
+     * @var Database
+     */
+    private $db;
+
+    public function __construct(Database $db)
+    {
+        $this->db = $db;
+    }
+
+    public function close()
+    {
+        return true;
+    }
+
+    public function destroy($sessionID)
+    {
+        return $this->db->table(self::TABLE)->eq('id', $sessionID)->remove();
+    }
+
+    public function gc($maxlifetime)
+    {
+        return $this->db->table(self::TABLE)->lt('expire_at', time())->remove();
+    }
+
+    public function open($savePath, $name)
+    {
+        return true;
+    }
+
+    public function read($sessionID)
+    {
+        $result = $this->db->table(self::TABLE)->eq('id', $sessionID)->findOneColumn('data');
+        return $result ?: '';
+    }
+
+    public function write($sessionID, $data)
+    {
+        $lifetime = time() + (ini_get('session.gc_maxlifetime') ?: 1440);
+
+        if ($this->db->table(self::TABLE)->eq('id', $sessionID)->exists()) {
+            return $this->db->table(self::TABLE)->eq('id', $sessionID)->update(array(
+                'expire_at' => $lifetime,
+                'data'      => $data,
+            ));
+        }
+
+        return $this->db->table(self::TABLE)->insert(array(
+            'id'        => $sessionID,
+            'expire_at' => $lifetime,
+            'data'      => $data,
+        ));
+    }
+}