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run code in 150+ php & hhvm versions
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<?php $allow = false; if(!$allow){ error_log(hello); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Notice: Use of undefined constant hello - assumed 'hello' in /in/3csOk on line 7 hello