3v4l.org

run code in 150+ php & hhvm versions
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<?php if(__FILE__!=$_SERVER['SCRIPT_FILENAME']||die('poof'))echo'echo';
based on peoRl
Output for 5.2.3 - 7.1.0
poof
Output for 4.3.0 - 5.2.2
Notice: Undefined index: SCRIPT_FILENAME in /in/L96Em on line 2 echo