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run code in 150+ php & hhvm versions
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<?php $teams = array('1'=> array(1,2,3)); var_dump(isset($teams[1])); var_dump(isset($teams['1']));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true) bool(true)