php文件下传、上载

以前一直在做java，最近转行去搞php开发，总觉得力不从心。这几天有个需求，是关于php的文件上传和下载的。给大家分享下自己的学习资料。

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1.先来个请求页面upload.html

  


Upload new news files

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2.php处理客户端请求的数据upload.html

  


Uploading file...
 0)
  {
    echo 'Problem: ';
    switch ($_FILES['userfile']['error'])
    {
      case 1:	echo 'File exceeded upload_max_filesize';
	  			break;
      case 2:	echo 'File exceeded max_file_size';
	  			break;
      case 3:	echo 'File only partially uploaded';
	  			break;
      case 4:	echo 'No file uploaded';
	  			break;
	  case 6:   echo 'Cannot upload file: No temp directory specified.';
	  			break;
	  case 7:   echo 'Upload failed: Cannot write to disk.';
	  			break;
    }
    exit;
  }

  // Does the file have the right MIME type?
  if ($_FILES['userfile']['type'] != 'text/plain')
  {
    echo 'Problem: file is not plain text';
    exit;
  }

  // put the file where we'd like it
  $upfile = '/uploads/'.$_FILES['userfile']['name'];

  if (is_uploaded_file($_FILES['userfile']['tmp_name'])) 
  {
     if (!move_uploaded_file($_FILES['userfile']['tmp_name'], $upfile))
     {
        echo 'Problem: Could not move file to destination directory';
        exit;
     }
  } 
  else 
  {
    echo 'Problem: Possible file upload attack. Filename: ';
    echo $_FILES['userfile']['name'];
    exit;
  }


  echo 'File uploaded successfully

'; 

  // reformat the file contents
  $fp = fopen($upfile, 'r');
  $contents = fread ($fp, filesize ($upfile));
  fclose ($fp);
 
  $contents = strip_tags($contents);
  $fp = fopen($upfile, 'w');
  fwrite($fp, $contents);
  fclose($fp);

  // show what was uploaded
  echo 'Preview of uploaded file contents:
';
  echo $contents;
  echo '
';

?>

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3.php文件下载

输出文件内容
	echo fread($file, filesize($filePath . $fileName));
	fclose($file);
	exit;

?>

?总的来说，上面的3个代码段只是简单介绍了php文件的上传下载，还有很多问题要解决，就例如上传大文件的时候怎么处理，批量上传、大文件下载等等问题。当然跟java一样，php也有很多框架可以解决这方面。