3v4l.org

run code in 300+ PHP versions simultaneously
<?php $source = ["a" => 1, "b" => 2, "c" => 3]; $input = ["d" => 4, "b" => 10]; $new = $source + ($source + $input); print_r($new);

preferences:
25.01 ms | 404 KiB | 5 Q