Aerys\Root::setIndexes PHP Method

    private function setIndexes($indexes)
    {
        if (is_string($indexes)) {
            $indexes = array_map("trim", explode(" ", $indexes));
        } elseif (!is_array($indexes)) {
            throw new \DomainException(sprintf("Array or string required for root index names: %s provided", gettype($indexes)));
        } else {
            foreach ($indexes as $index) {
                if (!is_string($index)) {
                    throw new \DomainException(sprintf("Array of string index filenames required: %s provided", gettype($index)));
                }
            }
        }
        $this->indexes = array_filter($indexes);
    }