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<?php $a = array(33,44,55); var_dump($a); $a[1] = null; var_dump($a); var_dump(isset($a[1]));
Output for 4.3.0 - 7.1.0
array(3) { [0]=> int(33) [1]=> int(44) [2]=> int(55) } array(3) { [0]=> int(33) [1]=> NULL [2]=> int(55) } bool(false)