Online PHP editor | refs for ts1ri

<?php define('__FLAG__','3xZG{dgznclXAwFVCUHPMWFViZBDSsltxKdrvFBVYHSr1}'); function stypr_crypt($_0){$_1 = $_2 = $_3 = array(); $_4 =array('?','(','@', ';', '$','#', ']', '&', '*'); $_4 = array_merge($_4,range('a','z'),range('0','9'),range('A','Z')); $_4 = array_merge($_4,array('!', ')', '_', '+', '|', '%', '/', '[', '.', ' ')); for($_5=9,$_6=0;$_6 < $_5;$_6++){ for($_7=0;$_7<$_5;$_7++){$_2[$_6][$_7] = $_4[$_6*$_5+$_7]; $_3[$_6][$_7] = str_rot13($_4[($_5*$_5-1)-($_6*$_5+$_7)]);} } unset($_4); $_8 = floor(strlen($_0)/2)*2; $_9 = ($_8 == strlen($_0))?'':$_0[strlen($_0)-1]; $_10 =array(); for($_11 = 0;$_11 < $_8;$_11+=2){$_12 = $_13 = strval($_0[$_11]); $_14 = $_15 = strval($_0[$_11+1]); $_16 = $_17 = array(); $_6=0; } } if(__FLAG__ === stypr_crypt(stypr_crypt(stypr_crypt($_GET['flag'])))) echo 'Correct!'; else echo 'Incorrect..'; ?>