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run code in 150+ php & hhvm versions
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<?php return bin2hex(strrev(base64_encode($secret))); ?>
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: secret in /in/nnoUI on line 2
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: secret in /in/nnoUI on line 2