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run code in 150+ php & hhvm versions
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<?php $a = array( '' => 'foo', 'foo' => '', null, array(), 1, true, false, ); $k = 'no'; $v = 'exist'; echo "$k => $v\n"; var_dump(!empty($a[$k])); var_dump(isset($a[$k]) && $a[$k]);
based on u3cvg
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
no => exist bool(false) bool(false)