addTagToCurrentContact.php

<?php

// add a tag to a current logged in or cookie based contact
// getCurrentContact() method will find the contact from logged in info or from the cookie from email link click
// For more api doc: https://github.com/FluentCRM/fluent-crm/wiki/PHP-API

$contact = FluentCrmApi('contacts')->getCurrentContact();
$tagsToAdd = [1,2];

if($contact) {
	$contact->attachTags($tagsToAdd);
}