3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ [2015 => '2015'], [2016 => '2016'], [2017 => '2017'], [2018 => '2018'], [2019 => '2019'], [2020 => '2020'], [2021 => '2021'], [2022 => '2022'], [2023 => '2023'] ]; var_export(array_merge(...$array));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => '2015', 1 => '2016', 2 => '2017', 3 => '2018', 4 => '2019', 5 => '2020', 6 => '2021', 7 => '2022', 8 => '2023', )
preferences:
61.53 ms | 402 KiB | 91 Q