Как организовать вытягивание из URL определенного значения в форму?

<?php
$url = 'http://username:password@hostname/path?arg=value#anchor';
print_r(parse_url($url));
echo parse_url($url, PHP_URL_PATH);

Array
(
[scheme] => http
[host] => hostname
[user] => username
[pass] => password
[path] => /path
[query] => arg=value
[fragment] => anchor
)

let link = 'domain.com/index.html?subacc4=asdffdsa123&deat=ojdai33';
let cutLink = link.substr(link.lastIndexOf('?') + 1);
let url = new URLSearchParams(cutLink);
let subid = url.get('subacc4');
console.log(subid)