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run code in 150+ php & hhvm versions
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<?php $a = array('1', 2 ,3 => '3', '4' => 4); $b = array('a', 'b' => 'b'); $v1 = &$a; var_dump($v1); $a[3] = 10; $v1 = $b; var_dump($v1); $b['a'] = 'A'; var_dump($v1);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(1) "1" [1]=> int(2) [3]=> string(1) "3" [4]=> int(4) } array(2) { [0]=> string(1) "a" ["b"]=> string(1) "b" } array(2) { [0]=> string(1) "a" ["b"]=> string(1) "b" }