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run code in 200+ php & hhvm versions
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<?php $a = array('l' => 'foo'); var_dump(isset($a[null])); var_dump(isset($a['4'])); var_dump(isset($a['l']));
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.1
bool(false) bool(false) bool(true)