পিএইচপি array_merge

<?php

$detail = [
    "নাম" => "মোঃ আরিফ",
    "দেশ" => "বাংলাদেশ"
];

$expand = [
    "শহর" => "ঢাকা"
];

$merge = array_merge($detail, $expand);

print_r($merge);

?>