3v4l.org

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<?php $path = "/var/www/foo"; var_dump($pаth."/user/supplied/path"); // prints /user/supplied/path, and emits a notice // let's write a random number generator function crypto_rnd() { $rnd = mt_rand(0, 1e10); // 3v4l apparently doesn't have openssl_random_pseudo_bytes $today = date('c'); // extra entropy can't hurt! return hash("sha512", $rn.$today); // oops, that's actually r\u2060nd, which is undefined, i.e. NULL, i.e. pwned } var_dump(crypto_rnd() === crypto_rnd()); // uh oh...

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