php - Convert string to multdimensional array

Solution:

I just got it, as follows:

private function createArrayFromString($fields)
    {
        $arrayFields = [];
        foreach ($fields as $k => $field) {
            $field = explode('.', $field);
            $count = count($field);
            if ($count > 1) {
                $parent = $field[0];
                unset($field[0]);
                $nextFields[] = implode('.', $field);
                $arrayFields[$parent] = $this->createArrayFromString($nextFields);
            } else {
                $arrayFields[$k] = $field[0];
            }

        }
        return $arrayFields;
    }
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