Php upload de photo

echo "<form method=POST action='index.php?action=ModifierMachine' name='FormAjoutMachine' enctype='multipart/form-data'>"; 
echo "<input type=hidden name=MAX_FILE_SIZE  value=2048>"; 
echo "URL Photo :<input type=file name='URLPhoto' />"; 
echo "</form>"; 

$URLPhoto = "Images/".$_FILES['URLPhoto']['name']; 

if (is_uploaded_file($_FILES["URLPhoto"]["tmp_name"]))  
{ 
    move_uploaded_file($_FILES["URLPhoto"]["tmp_name"], $URLPhoto); 
    .... 
} 
else 
{ 
    .... 
} 

if(!move_uploaded_file()) {
   die("Impossible d'uploader le fichier"); 
} else {
   /*---*/
}