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run code in 150+ php & hhvm versions
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<?php define(FOO, 5); echo 5 * FOO; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant FOO - assumed 'FOO' in /in/C8kRF on line 1 25