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run code in 150+ php & hhvm versions
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<?php $values = array(1,2); var_dump(isset($values[0]), $values[0]); var_dump(isset($values[0][0]), $values[0][0]);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) int(1) bool(false) NULL
Output for hhvm-3.10.0

Process exited with code 153.