PHP OOP+MySQLi hjælp, ver.2

PHP kode 

 <?php
 class Database {
     protected $host = 'localhost';
     protected $user = '';
     protected $pass = '';
     protected $db = '';
 
     public function __construct($host, $user, $pass, $db) {
         $this->host = $host;
         $this->user = $user;
         $this->pass = $pass;
         $this->db = $db;
     }
     
     public function connect() {
         if(!$this->conn) {
             $conn = new Mysqli($this->host, $this->user, $this->pass, $this->db);
             
             if ($conn->connect_errno) {
                 throw new Exception('Connect failed: '.$conn->connect_error);
             }
             
             $this->conn = $conn;
         }
         return $this; 
     }
     
     public function query($sql) {
         if($this->result) {
             $this->result->close();
         }
         
         $result = $this->conn->query($sql, MYSQLI_USE_RESULT); 
         
         if ($result) {
             $this->result = $result;
             return $this->result;
         }
         
         return null;
     }
     
     public function close(){
         if ($this->conn){
             $this->conn->kill($this->conn->thread_id);
             $this->conn->close();
             $this->conn = null;
         }
     }
 }
 
 class SpeciesList {
     public function __construct(Database $db) {
         $this->db = $db;
     }
     
     public function getUserInfo($id){
         $htmlen = new htmlen();
         $output = '';
         $result = $this->db->query('SELECT * FROM users WHERE id='.$id);
         while($row = $result->fetch_assoc()) {
             $output .= $htmlen->content_div($row['img'], $row['about'], $row['desc_text_date'], $row['desc_date'], $row['desc_text_hd']);
         }
         return $output;
     }
 }
 
 
 
 
 // The badass code
 $db = new Database('host', 'user', 'pass', 'database');
 
 $list = new SpeciesList($db);
 print $list->getUserInfor(strip_tags($_GET['id']));
 
 ?>

PHP kode 

 <?php
 class Database {
   //Database connection settings.
   private static $HOST = "localhost";
   private static $USER = "";
   private static $PASS = "";
   private static $DB = "";
 
   //Retrieve a new MySQL Connection.
   public static function open(){
       return @new Mysqli(self::$HOST, self::$USER, self::$PASS, self::$DB); 
   }
 
   public static function close($connection){
     if ($connection != null && $connection instanceof Mysqli){
       $connection->kill($connection->thread_id);
       $connection->close();
     }
   }
 }
 ?>