Eduardokum\LaravelBoleto\Boleto\Render\AbstractPdf::_beginpage PHP Method

    function _beginpage($orientation, $size)
    {
        parent::_beginpage($orientation, $size);
        if ($this->NewPageGroup) {
            // start a new group
            $n = sizeof($this->PageGroups) + 1;
            $alias = '{' . $n . '}';
            $this->PageGroups[$alias] = 1;
            $this->CurrPageGroup = $alias;
            $this->NewPageGroup = false;
        } elseif ($this->CurrPageGroup) {
            $this->PageGroups[$this->CurrPageGroup]++;
        }
    }