3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = [ 'Arvind' => 'Basu', 'Rampal' => 'Singh' ]; $b = [ 'Anjali' => 'Basu', 'Roopashri' => 'Singh' ]; $c = array_merge($a, $b); ksort($c); echo print_r($c);
Output for 7.1.25 - 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 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
Array ( [Anjali] => Basu [Arvind] => Basu [Rampal] => Singh [Roopashri] => Singh ) 1
preferences:
112.65 ms | 1540 KiB | 4 Q