Pop\Pdf\Object\Page::__toString PHP Метод

    public function __toString()
    {
        // Format the content objects.
        $content_objs = implode(" 0 R ", $this->content);
        $content_objs .= " 0 R";
        // Format the annotations.
        if (count($this->annots) > 0) {
            $annots = '/Annots[';
            $annots .= implode(" 0 R ", $this->annots);
            $annots .= " 0 R]";
        } else {
            $annots = '';
        }
        // Format the xobjects.
        if (count($this->xobjs) > 0) {
            $xobjects = '/XObject<<';
            $xobjects .= implode('', $this->xobjs);
            $xobjects .= '>>';
        } else {
            $xobjects = '';
        }
        // Format the fonts.
        if (count($this->fonts) > 0) {
            $fonts = '/Font<<';
            $fonts .= implode('', $this->fonts);
            $fonts .= '>>';
        } else {
            $fonts = '';
        }
        // Swap out the placeholders.
        $obj = str_replace('[{page_index}]', $this->index, $this->data);
        $obj = str_replace('[{parent}]', $this->parent, $obj);
        if ($annots != '' && strpos($obj, '[{annotations}]') === false) {
            $obj = str_replace('/MediaBox', $annots . '/MediaBox', $obj);
        } else {
            $obj = str_replace('[{annotations}]', $annots, $obj);
        }
        if ($xobjects != '' && strpos($obj, '[{xobjects}]') === false) {
            $obj = str_replace('/ProcSet', $xobjects . '/ProcSet', $obj);
        } else {
            $obj = str_replace('[{xobjects}]', $xobjects, $obj);
        }
        if ($fonts != '' && strpos($obj, '[{fonts}]') === false) {
            $obj = str_replace('/ProcSet', $fonts . '/ProcSet', $obj);
        } else {
            $obj = str_replace('[{fonts}]', $fonts, $obj);
        }
        $obj = str_replace('[{content_objects}]', $content_objs, $obj);
        return $obj;
    }