Fopen

[trasher666]

allora ho fatto così

function finish() 
    {
    
    global $lang;
    
    $file = "../config/config.php"; 
    
    if(isset($_POST['invia'])) {
    
    $db_user   = $_POST['SQLuser'];
    $db_pass   = $_POST['SQLpass'];
    $db_name   = $_POST['SQLname'];
    $db_host   = $_POST['SQLhost'];
    $prefix    = $_POST['SQLprefix'];

    $content = 
    "\$db_user = '$db_user';\r\n 
     \$db_pass = '$db_pass';\r\n 
     \$db_name = '$db_name';\r\n 
     \$db_host = '$db_host';\r\n 
     \$prefix  = '$prefix';\r\n";

    $fp = fopen($file, "a"); 
    fwrite($fp, $content);
    fclose($fp); 
    echo"Done!";
    header ('location: index.php?action=query');
        }
        else 
        { 
        echo "$lang[57]";
        }  
    
        } 

ma nn va mi mostra l'errore ($lang[57]= errore)
quindi nn scrive