Pop\Pdf\Import::getRefs PHP Метод

    protected function getRefs($data)
    {
        $r = array();
        $refs = array();
        // Grab reference start points.
        if (strpos($data, 'stream') !== false) {
            $data = substr($data, 0, strpos($data, 'stream'));
        }
        preg_match_all('/\\d*\\s0*\\sR/', $data, $r, PREG_OFFSET_CAPTURE);
        foreach ($r[0] as $value) {
            $refs[] = str_replace(' 0 R', '', $value[0]);
        }
        sort($refs);
        return $refs;
    }