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<?php $a = array(); $a[0] = "1"; $b = array(); $b = $a; $b['foo'] = 42; var_dump($b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "1" ["foo"]=> int(42) }