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<?php $x = array(1, 2, 3, 4, 5); var_dump($x); unset($x[3]); ?>
Output for 4.3.0 - 7.1.0
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) }