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run code in 150+ php & hhvm versions
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<?php $x = array(); $x['a']['b'] = true; $x['a']['c'] = false; if (!empty($x['a']['b']['d'])) { print "true"; } else { print "false"; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
false