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run code in 150+ php & hhvm versions
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<?php $wat = "wat"; $wat[2] = z; print $wat;
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 z - assumed 'z' in /in/vpW10 on line 3 waz