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<?php $a = array(1, 2); $b = $a; $b[0] = 222; var_dump($a); var_dump($b);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> int(1) [1]=> int(2) } array(2) { [0]=> int(222) [1]=> int(2) }