3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(array_map('strval', array(3 => 1, 4 => 2))); var_dump(array_map('strval', array('3' => 1, '4' => 2)));
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, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { [3]=> string(1) "1" [4]=> string(1) "2" } array(2) { [3]=> string(1) "1" [4]=> string(1) "2" }

preferences:
243.25 ms | 406 KiB | 374 Q