Is there a formula function to get the string representation of a multi-enum field?

[tothewine]

I am writing a formula involving a multi-enum field. Is there a way to turn it into a string for further processing ?

[tothewine]

OK I found none so I wrote one, please tell me if this code is the best way to do it.

<?php

namespace Espo\Custom\Core\Formula\Functions\CustomGroup;
use \Espo\Core\Exceptions\Error;

class ArrayJoinType extends \Espo\Core\Formula\Functions\Base
{
    public function process(\StdClass $item) {

        if (!property_exists($item, 'value') || !is_array($item->value)) {
            throw new Error('Bad \'Custom\\ArrayJoin\' process parameter.');
        }

        if (count($item->value) <= 0) {
            throw new Error('Bad \'Custom\\ArrayJoin\' argument count.');
        }

        $list = $this->evaluate($item->value[0]);
        if (!is_array($list)) {
            throw new Error('Bad \'Custom\\ArrayJoin\' argument #1 is not array.');
        }

        $glue = '; ';
        if (count($item->value) > 1) {
            try {
                $tmp1 = $this->evaluate($item->value[1]);
                if (is_string($tmp1)) $glue = $tmp1;
            } catch (\Exception $e) {
                $glue = '; ';
            }
        }

        $ret = implode($glue, $list);

        return $ret;
    }
}