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run code in 200+ php & hhvm versions
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<?php $xml = $_POST['xml']; if (!is_null($xml)) { echo "asd"; } ?>
Output for 5.3.0 - 7.2.0
Notice: Undefined index: xml in /in/OTPCl on line 2
Output for 4.3.0 - 5.2.17
Notice: Undefined index: xml in /in/OTPCl on line 2