View file public_html/ftp/exit.php

<?php
error_reporting(0);
$k=trim($_GET['k']); include("key.php"); include_once("cnfg.php");

$str="";
if ($fl=@file("userkeys.dat")) {
 for ($i=0;$i<count($fl);$i++) {
  list($p1,$p2,$p3,$p4,$p5,$p6,$p7)=split('\^',trim($fl[$i]));
  if ($p1<>$k) {$str.=$fl[$i];}
  else {
   include_once("freedata.php"); freedata($p1);
  }
 }
}
$f=@fopen("userkeys.dat","w"); @fwrite($f,$str); @fclose($f);
header("Location: $dftp/index.php"); exit;
?>