View file funin/acp/submit.php

<?php
$fn=$_REQUEST["fname"];

 $newname = str_replace(array(".bmp", ".gif",".jpg",".png"), "", $fn);
$newfn=".$newname.";
echo"$newfn";
echo"<br/>";
$clean = preg_replace("/^[^a-z0-9]?(.*?)[^a-z0-9]?$/i", "$1", $fn);
echo"$clear";

if (preg_match("/[^A-Za-z0-9\!]/", $fn))
{
    echo "Invalid Characters!";
}
else
{
if(strlen($fn)<4)
{
    echo "<center>Use minimum 4 charactor in nick</center>";
}
else
{
echo"nick work";
}
}

?>