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run code in 300+ PHP versions simultaneously
<?php $x = [0, 1, 2]; unset($x[2]); $y = $x; $x[] = 'new'; $y[] = 'new'; var_dump($x); var_dump($y);
Output for 5.5.18 - 5.5.38, 5.6.1 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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(3) { [0]=> int(0) [1]=> int(1) [3]=> string(3) "new" } array(3) { [0]=> int(0) [1]=> int(1) [3]=> string(3) "new" }
Output for 5.5.0 - 5.5.17, 5.6.0
array(3) { [0]=> int(0) [1]=> int(1) [2]=> string(3) "new" } array(3) { [0]=> int(0) [1]=> int(1) [3]=> string(3) "new" }

preferences:
244.08 ms | 402 KiB | 330 Q