<a
    href=\"https://www.threads.net/intent/post?text=#PAGE_TITLE_UTF_ENCODED#&url=#PAGE_URL_ENCODED#+\"
    onclick=\"window.open(this.href,'','toolbar=0,status=0,width=611,height=231');return false;\"
    target=\"_blank\"
    class=\"main-share-threads\"
    rel=\"nofollow\"
    title=\"".$title."\"
></a>\n";

You can see how does it work on one of my websites (based on 1C-Bitrix): https://pro-hosting.biz/news/companies/750.html