Избавляемся от статических классов и синглтонов

src/Role/User.php

@@ -0,0 +1,69 @@
+<?php
+
+// Класс должен быть в библиотеке приложения 
+class Role_User
+{
+    const LIFE_TIME = 1800; // = 30min * 60sec;
+
+    public $fullname;
+    public $name;
+    public $access;
+    public $password;
+	public $id;
+    public $db;
+
+    protected function __construct()
+    { 
+    }
+
+    public function setDB(Database $db) 
+    {
+        $this->db = $db;
+    }
+
+    public function getUserByQuery(Database_Statement $stmt) 
+    {
+        global $GROUPS;
+        $result = $stmt->executeQuery();
+        if ($result->next()) {
+            $this->access = $GROUPS[$result->getString('access')];
+            $this->name   = $result->getString('login');
+			$this->id     = $result->getInt('id_user');
+            $this->password   = $result->getString('password');
+            $this->fullname = implode(' ', array(
+                $result->getString('surname'), 
+                $result->getString('firstname'), 
+                $result->getString('patronymic')));
+            return $result;
+        }
+        return null;
+    }
+
+    public static function getUserByLogin($login) 
+    {
+        $stmt = $this->$db->prepareStatement("SELECT * FROM users WHERE login = ?");
+        $stmt->setString(1, $login);
+        $result = $this->getUserByQuery($stmt);
+        if ($result) { 
+            $time = time();
+            $id = $this->id;
+            $this->$db->executeQuery("UPDATE users SET lasttime = $time WHERE id_user = $id"); // Время входа
+        }
+        return $result;
+    }
+
+    public static function getUserById($id) 
+    {
+        $stmt = $this->$db->prepareStatement("SELECT * FROM users WHERE id_user = ?");
+        $stmt->setInt(1, $_SESSION ['access']);
+        $result = $this->getUserByQuery($stmt);
+        if ($result) {
+            $lasttime = $result->getInt('lasttime');
+            $time = time();
+            if ($time - $lasttime > $this->LIFE_TIME) return null; // Вышло время сессии 
+            $id = $this->$id;
+            $this->db->executeQuery("UPDATE users SET lasttime = $time WHERE id_user = $id"); // Время последнего обращения входа
+        }
+        return $result;
+    }
+}