php : Warning: Invalid argument supplied for foreach()

[RespectCS]

I just can't figure it out.. but i got a feeling the problem is around there when im throwing the exception messages. I got almost the same code in my registration class. There is just give the errors array the messages normaly like $this->errors[] = "some error".\[code\]<?phpclass class_login { private $id; private $username; private $password; private $passmd5; private $errors; private $access; private $login; private $ltoken; public function __cunstruct() { $this->errors = array(); $this->login = isset($_POST['login'])? 1:0; $this->access = 0; $this->ltoken = $_POST['ltoken']; $this->id = 0; $this->username = ($this->login)? $this->filter($_POST['lusername']) : $_SESSION['username']; $this->password = ($this->login)? $this->filter($_POST['lpassword']) : ''; $this->passmd5 = ($this->login)? md5($this->password) : $_SESSION['password']; } public function isLoggedIn() { ($this->login)? $this->verifyPost() : $this->verifySession(); return $this->access; } public function filter($var) { return preg_replace('/[^a-zA-Z0-9]/','',$var); } public function verifyPost() { try { if(!$this->tokenValid()) throw new Exception('Invalid Form Submission!'); if(!$this->isDataValid()) throw new Exception('Ivalid Form Data!'); if(!$this->verifyDatabase()) throw new Exception('Invalid Username/Password!'); $this->access = 1; $this->registerSession(); } catch(Exception $e) { $this->errors[] = $e->getMessage(); } } public function verifySession() { if($this->sessionExist() && $this->verifyDatabase()) $this->access = 1; } public function verifyDatabase() { include('db_connect.php'); $data = http://stackoverflow.com/questions/10552093/mysql_query("SELECT ID FROM users WHERE username = '($this->username)' AND password = '($this->passmd5)'"); if (mysql_num_rows($data)) { list($this->id) = @array_values(mysql_fetch_assoc($data)); return true; } else return false; } public function isDataValid() { return (preg_match('/[^a-zA-Z0-9](5,12)$/', $this->username) && preg_match('/[^a-zA-Z0-9](5,12)$/', $this->password))? 1:0; } public function tokenValid() { return (!isset($_SESSION['ltoken']) || $this->ltoken != $_SESSION['ltoken'])? 0 : 1; } public function registerSession() { $_SESSION['ID'] = $this->id; $_SESSION['username'] = $this->username; $_SESSION['password'] = $this->passmd5; } public function sessionExist() { return (isset($_SESSION['username']) && isset($_SESSION['password']))? 1 : 0; } public function show_errors() { foreach($this->errors as $key=>$value) echo $value."</br>"; }}?>\[/code\]