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run code in 300+ PHP versions simultaneously
<?php function decrypt($a) { $tmp = strtolower(strrev($a)); $tmps = substr(hexdec($tmp),0, 4) ^ hexdec('BFF') ^ hexdec('D77D'); } echo decrypt("tarunkant"); define('__FLAG__', 'flag{hidden_flag}'); if(decrypt($_REQUEST['pass']) == 'pwning_the_phpreverse!') { __FLAG__; } ?>

preferences:
32.6 ms | 402 KiB | 5 Q