Ho la seguente script preso da un libro eppure mi da un errore non riesco a capire cosa signichi
codice:
<?php 
require_once('user_manager.inc');
require_once('errors.inc');

session_start();

//Verifica input utente

$uname=isset($_POST['username']) ? $_POST['username']: '';
$pw1=isset($_POST['password1']) ? $_POST['password1']: '';
$pw2=isset($_POST['password2']) ? $_POST['password2']: '';
$fname=isset($_POST['nome']) ? $_POST['nome']: '';
$email=isset($_POST['email']) ? $_POST['email']: '';
$year=isset($_POST['anno']) ? $_POST['year']: '';
$month=isset($_POST['month']) ? $_POST['month']: '';
$day=isset($_POST['day']) ? $_POST['day']: '';

//Verificare valori obbligatori

if ($uname=='' or $pw1=='' or $pw2=='' or $email=='')
{
  throw new InvalidInputException();
}
 //Verificare se i valori sono sensati

 $usermgr=new UserManager();
 $result=$usermgr->isValidUserName($uname);
 if ($result !==True)
 throw new InvalidInputException();
 
 //Verifica che le password siano uguali
 if($pw1!=$pw2)
 throw new InvalidInputException();
 
 // Verifica che la data sia sensata
 
 if (!checkdate($month,$day,$year))
 throw new InvalidInputException();
 
 //Creare L'account
 $usermgr->createAccount($uname,$pw1,$pw2,$fname,$email,$year,$month,$day);
 //reindirezzare alla pagina utente;
 header ('Location: form.php');
 ?>
 <?php
require_once('dbconn.inc');
require_once('errors.inc');

class UserManager
{
 function __construct()
 {
   //non si ha ancora l'inizializzazione
 }
}
function isValidUserName($in_user_name)
{
 if($in_user_name=='' or ereg('[:alnum:]_-]',$in_user_name)===TRUE)
 return false;
 else
 return true;
}
 function createAccount
(
$in_unname,
$in_pw,
$in_fname,
$in_email,
$in_year,
$in_month,
$in_day
)
{ 
 //Convalida input utnete
 if($in_pw=='' or $in_fname='' or !$this->isValidUserName($in_uname))
 {
   throw new InvalidArgumentExcepiton();
 }
 //stabilire connessione al db
 
 $conn=$this->getConnection();
 try
 {
  //Accertarsi che non esista il nome utente
  $existes=False;
  $existes=$this->userNameExists($in_uname, $in_conn);
  if($existes===TRUE)
  throw new UserAlreadyExistEception();
  $uname=$this->super_escape_string($in_uname, $conn);
  $fname=$this->super_escape_string($in_fname, $conn);
  $email=$this->super_escape_string($in_email, $conn);
  $pw=md5($in_pw);
  
  $qstr=<<<E0QUERY
  INSERT INTO USER
  (user_name,password,full_name,user_email,birthdate)
  VALUES ('$uname', '$pw', '$fname', $in_year-$in_month-$in_day)
E0QUERY;
  
 // inserire un nuovo utente
 $result=@$conn->query($qstr);
 if($result===FALSE)
 throw new DatabaseErrorException($conn->error);
 //si vuole restituire l'Id utente appena creato
 $user_id=$conn->insert_id;
 }
 catch (Excepiton $e)
 {
   if (isset ($conn))
   $conn->close();
   throw $e;
 }
 // esegue il cleanup e uscire
 $conn->close();
 return $user_id;
 }
 function getConnection()
 {
   $conn=new mysqli('localhost', 'root', 'mysql', 'login');
   if(mysqli_connect_errno()!==0)
   throw new DatabaseErrorException(mysqli_connect_error());
   return $conn;
 }
 function super_escape_string($in_string,$in_conn,$in_removePct=False)
 {
   $str=$in_conn->real_escape_string($in_string);
   if($in_removePct)
   {
     $str=ereg_replace('(%)',"\\\1", $str);
	 return $str;
   }
 }
 function userNameExists ($in_uname, $in_db_conn=Null)
 {
   if ($in_name=='')
   throw new InvalidArgumentException();
   if($in_db_conn ===NULL)
   $conn=$this->getConnection();
   else
   $conn=$in_db_conn;
   try
   {
     $name=$this->super_escape_string($in_uname,$conn);
     $qstr=<<<E0QUERY
SELECT user_name From Users_where user_name='$name'
E0QUERY;

$results=@$conn->query($qstr);
if($results===FALSE)
throw new DatabaseErrorExcption($conn->error);
$user_exists=false;
while (($row=@$results->fetch_assoc())!==NULL)
{
  if($row['user_name']==$in_uname)
  {
    $user_exists=True;
	break;
  }
}	 
   }
   catch(Excetpion $e)
   {
    if ($in_db_conn===NULL and isset($conn))
	$conn->close();
	throw $e;
    
   }
   $results->close();
   if($in_db_conn==NULL)
   $conn->close();
   return $user_exists;
 }
mi genera i seguenti errori
Warning: require_once(user_manager.inc) [function.require-once]: failed to open stream: No such file or directory in C:\Program Files (x86)\EasyPHP-5.3.9\www\login\create_user.php on line 2

Fatal error: require_once() [function.require]: Failed opening required 'user_manager.inc' (include_path='.;C:\php\pear') in C:\Program Files (x86)\EasyPHP-5.3.9\www\login\create_user.php on line 2

premetto che uso db mysql