PHP PDF解析器SMALOt和TCPDF解析器

Question

我曾经获得过PDF文件的元数据。我使用SMALOT pdf Parser和TCPDF Parser解析文件。

我使用smalot pdf parse解析pdf文件，然后使用TCPDF解析器库获取pdf文件的元数据和内容。它适用于小型pdf文件，但当我解析10 MB或大型pdf文件时，内存限制被挖出并执行停止并且没有出现任何错误。我设置了内存限制1024M。

public function parseFile($filename)
{
  return $this->parseContent($filename);
 }
 public function parseContent($filename)
    {
        // Create structure using TCPDF Parser.
        ob_start();
        $parser = new \TCPDF_PARSER(file_get_contents($filename));
        list($xref, $data) = $parser->getParsedData();
//            print_r($tcpdf->getParsedData());
//            $parser = new \TCPDF_PARSER(ltrim($content));

        list($xref, $data) = $parser->getParsedData();
        unset($parser);
        ob_end_clean();

        if (isset($xref['trailer']['encrypt']))
        {
            throw new \Exception('Secured pdf file are currently not supported.');
        }

        if (empty($data))
        {
            throw new \Exception('Object list not found. Possible secured file.');
        }

        // Create destination object.
        $document = new Document();
        $this->objects = array();

        foreach ($data as $id => $structure)
        {
            $this->parseObject($id, $structure, $document);
            unset($data[$id]);
        }

        $document->setTrailer($this->parseTrailer($xref['trailer'], $document));
        $document->setObjects($this->objects);

        return $document;
    }