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<?=$i++?>
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: i in /in/H7F9Q on line 1
Output for hhvm-3.13.2
Notice: Undefined variable: i in /in/H7F9Q on line 3
Output for 4.3.0 - 5.3.29
<?=$i++?>