3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $filename=strtoupper($_SESSION["SystemNameStr"]).'_LOGINHISTORY_'.date('Ymd').'.CSV';
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: _SESSION in /in/820ug on line 3
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined index: SystemNameStr in /in/820ug on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: _SESSION in /in/820ug on line 3