使用PdfParser库允许的内存大小为134217728字节错误

Question

我正在尝试使用PdfParser库从pdf文件中提取数据。

当我尝试使用几个大而复杂的pdf文件时，它给了我一个错误：

  

允许的内存大小为134217728字节

我需要一些永久的解决方案，要么是库已损坏，要么我的实现错误。

这是我的代码：

class crawlController extends Controller
{
  public function crawler()
  {
        $dirPath = '/home/development/pdf_root';
        $this->getFileFolderTree($dirPath);
  }

    public function getFileFolderTree($rootDirectory)
    {
        $this->goIntoFolder($rootDirectory);
    }

    public function goIntoFolder($dirPath)
    {
      // Get all the direct sub folders of the root folder
      try
      {
        $dirList = File::directories($dirPath);
      }
      catch(\App\Exceptions\InvalidArgumentException $e)
      {
        require $e->getMessage();        
      }
      if(count($dirList) == 0)
      {
        //search for files now
        $this->searchFiles($dirPath);
      }
      else
      {
        // Loop through the list of diectories
        foreach ($dirList as $dir) 
        {
          // Print name of the selected directory
          echo "Folder name : ",basename($dir)," Parent Folder :",basename($dirPath),"<br/>";

          // Recursivly search selected directory
          $this->goIntoFolder($dir); 
        }
        echo "<hr><br/>";
      }
    }

    public function searchFiles($dirPath)
    {
      // Read all files
      $files = File::files($dirPath);
      $result = FALSE;

      // If no files exists
      if(count($files) > 0)
      {
        foreach ($files as $file) 
        {
          // Check if file is a pdf file.
           if(0 == strcasecmp('pdf',File::extension($file)))
           {
              // Read the file
              $this->readFileData($file);
           }
        }        
        $result = TRUE;
      }
      return $result;
    }

    public function readFileData($file)
    {   
        // Build PdfTotext object
        $parser = new \Smalot\PdfParser\Parser();
        $pdfLoad = $parser->parseFile($file);

        $content = $pdfLoad->getText();
        $txtFilename = basename($file).".txt";
        $bytesWritten = File::append($txtFilename,$content);
        if($bytesWritten)
        {
          echo "success : ",$file;
        }
        else
        {
          echo "Faliure : ",$file;
        }
        unset($parser);
    }
}