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run code in 150+ php & hhvm versions
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<?php var_dump(isset($c->a->b)); ?>
Output for 4.3.0 - 4.4.9, 5.1.6 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for 5.0.0 - 5.1.5
Notice: Trying to get property of non-object in /in/F49SE on line 3 bool(false)