3v4l.org

run code in 300+ PHP versions simultaneously
<?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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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" }

preferences:
263.31 ms | 406 KiB | 311 Q