if (isset($_POST['login_btn'])) {
	if ((!empty($_POST['login_login'])) && (!empty($_POST['login_pass']))) {
		$login = trim(htmlspecialchars($_POST['login_login']));
		$pass = trim(htmlspecialchars($_POST['login_pass']));
		$remember = 0;
		$remember = (!empty($_POST['remember']) ? 1 : 0);
		
		if (!empty($arr = validate_login($login, $pass, $remember))){
			echo "validated" ;
		}
		else{
			echo "not validated";
		}
	}
	else{
		header("Location: /");
	}
}

function validate_login($login, $pass, $remember){
	global $handler;
	
	$sql = "SELECT  user_id, 
					user_account, 
					user_name, 
					user_pwd
					FROM users 
					WHERE user_account = ?";

	try {  
		$query = $handler->prepare($sql);  
		$query -> execute(array($login));
		$result = $query->fetchAll(PDO::FETCH_ASSOC); 
		$query -> closeCursor(); 
		if ((pwd_verification($pass, $result[0]['user_pwd'])) == TRUE){
			return $result;	
		}
		else {
			return false;
		}
	} catch (Exception $e) {   
		echo "Ошибка с запросом";
		return false;
	}
}

function pwd_verification($pass, $login_pass){
	if (($pass === $login_pass)) {
		return true;
	}
	else{
		return false;
	}
}