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run code in 200+ php & hhvm versions
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<?php $array = [ 'foo' => 'test', '0' => 'bla' ]; var_dump(isset($array['0']));
based on aA1ua
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.3.0beta1
bool(true)