3v4l.org

run code in 300+ PHP versions simultaneously
<?php $default = [ 'value' => '', ]; $input = [ 'value' => null, ]; var_dump(array_merge($default, $input));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(1) { ["value"]=> NULL }
preferences:
89.03 ms | 1244 KiB | 4 Q