3v4l.org

run code in 300+ PHP versions simultaneously
<?php $obj = (object)array(1,2,3); $obj->{1} = "Double array key!"; print_r((array)$obj);
Output for 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 - 8.3.7
Array ( [0] => 1 [1] => Double array key! [2] => 3 )
Output for 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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25
Array ( [0] => 1 [1] => 2 [2] => 3 [1] => Double array key! )
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Property name must be a string in /in/K47NN on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.
preferences:
247.91 ms | 401 KiB | 426 Q