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run code in 200+ php & hhvm versions
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<?php $x = array(); !empty($x) || $x = array(1, 2, 3, 4); var_dump($x);
based on jRfZU
Output for 4.3.0 - 7.2.0
array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) }