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run code in 200+ php & hhvm versions
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<?php if ($tmp) { print 'Ja'; } else { print 'Nein'; }
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
Notice: Undefined variable: tmp in /in/EjhtZ on line 2 Nein