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php获取本地电脑文件后下载另存为

WBOY
WBOYオリジナル
2016-05-25 16:54:531380ブラウズ
在php中下载文件我们用得最多的是直接使用readfile()函数,readfile()可以实现把服务器源文件给下载,下面我来给大家介绍readfile下载文件的方法与性能介绍

例1

 代码如下 复制代码

header(“Content-Type: text/html; charset=UTF-8″);
header(“Content-type:application/text”);

// 文件将被称为 downloaded.pdf
header(“Content-Disposition:attachment;filename=log.text”);

// PDF 源在 original.pdf 中
readfile(“ptindex_user_profilebasc.html”);

?>

例2

 代码如下 复制代码

 

 $item=trim($_GET['fileName']).".txt";  
    $abs_item='/usr/home/文件夹名称/文件夹名称/文件夹名称/'.$item;  
    $browser='IE';  
    header('Content-Type: '.(($browser=='IE' || $browser=='OPERA')?  
        'application/octetstream':'application/octet-stream'));  
    header('Expires: '.gmdate('D, d M Y H:i:s').' GMT');  
    header('Content-Transfer-Encoding: binary');  
    header('Content-Length: '.filesize($abs_item));  
    if($browser=='IE') {  
        header('Content-Disposition: attachment; filename="'.$item.'"');  
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');  
        header('Pragma: public');  
    } else {  
        header('Content-Disposition: attachment; filename="'.$item.'"');  
        header('Cache-Control: no-cache, must-revalidate');  
        header('Pragma: no-cache');  
    }  
@readfile($abs_item); 

上面只能下载本地函数,如果要下载远程的我们可以如下操作PHP远程下载文件到本地的函数

 代码如下 复制代码

echo httpcopy("/baidu_sylogo1.gif");

function httpcopy($url, $file="", $timeout=60) {
    $file = empty($file) ? pathinfo($url,PATHINFO_BASENAME) : $file;
    $dir = pathinfo($file,PATHINFO_DIRNAME);
    !is_dir($dir) && @mkdir($dir,0755,true);
    $url = str_replace(" ","%20",$url);

    if(function_exists('curl_init')) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        $temp = curl_exec($ch);
        if(@file_put_contents($file, $temp) && !curl_error($ch)) {
            return $file;
        } else {
            return false;
        }
    } else {
        $opts = array(
            "http"=>array(
            "method"=>"GET",
            "header"=>"",
            "timeout"=>$timeout)
        );
        $context = stream_context_create($opts);
        if(@copy($url, $file, $context)) {
            //$http_response_header
            return $file;
        } else {
            return false;
        }
    }
}
?>

最后分享一个支持多种文件下载的类函数

 代码如下 复制代码

/**
 * 使用方法:
 * require_once 'download.class.php';
 * $filepath = './path/filename.html';
 * $downname = 'downname.html';
 * $down = new download($filepath,$downname);
 * 或
 * $down = new download();
 *
 * */
class download
{
 var $filepath;
 var $downname;
 var $ErrInfo;
 var $is_attachment = false;
 var $_LANG = array(
   'err' => '错误',
   'args_empty' => '参数错误。',
   'file_not_exists' => '文件不存在!',
   'file_not_readable' => '文件不可读!',
  );
 var $MIMETypes = array(
   'ez' => 'application/andrew-inset',
   'hqx' => 'application/mac-binhex40',
   'cpt' => 'application/mac-compactpro',
   'doc' => 'application/msword',
   'bin' => 'application/octet-stream',
   'dms' => 'application/octet-stream',
   'lha' => 'application/octet-stream',
   'lzh' => 'application/octet-stream',
   'exe' => 'application/octet-stream',
   'class' => 'application/octet-stream',
   'so' => 'application/octet-stream',
   'dll' => 'application/octet-stream',
   'oda' => 'application/oda',
   'pdf' => 'application/pdf',
   'ai' => 'application/postscrīpt',
   'eps' => 'application/postscrīpt',
   'ps' => 'application/postscrīpt',
   'smi' => 'application/smil',
   'smil' => 'application/smil',
   'mif' => 'application/vnd.mif',
   'xls' => 'application/vnd.ms-excel',
   'ppt' => 'application/vnd.ms-powerpoint',
   'wbxml' => 'application/vnd.wap.wbxml',
   'wmlc' => 'application/vnd.wap.wmlc',
   'wmlsc' => 'application/vnd.wap.wmlscrīptc',
   'bcpio' => 'application/x-bcpio',
   'vcd' => 'application/x-cdlink',
   'pgn' => 'application/x-chess-pgn',
   'cpio' => 'application/x-cpio',
   'csh' => 'application/x-csh',
   'dcr' => 'application/x-director',
   'dir' => 'application/x-director',
   'dxr' => 'application/x-director',
   'dvi' => 'application/x-dvi',
   'spl' => 'application/x-futuresplash',
   'gtar' => 'application/x-gtar',
   'hdf' => 'application/x-hdf',
   'js' => 'application/x-javascrīpt',
   'skp' => 'application/x-koan',
   'skd' => 'application/x-koan',
   'skt' => 'application/x-koan',
   'skm' => 'application/x-koan',
   'latex' => 'application/x-latex',
   'nc' => 'application/x-netcdf',
   'cdf' => 'application/x-netcdf',
   'sh' => 'application/x-sh',
   'shar' => 'application/x-shar',
   'swf' => 'application/x-shockwave-flash',
   'sit' => 'application/x-stuffit',
   'sv4cpio' => 'application/x-sv4cpio',
   'sv4crc' => 'application/x-sv4crc',
   'tar' => 'application/x-tar',
   'tcl' => 'application/x-tcl',
   'tex' => 'application/x-tex',
   'texinfo' => 'application/x-texinfo',
   'texi' => 'application/x-texinfo',
   't' => 'application/x-troff',
   'tr' => 'application/x-troff',
   'roff' => 'application/x-troff',
   'man' => 'application/x-troff-man',
   'me' => 'application/x-troff-me',
   'ms' => 'application/x-troff-ms',
   'ustar' => 'application/x-ustar',
   'src' => 'application/x-wais-source',
   'xhtml' => 'application/xhtml+xml',
   'xht' => 'application/xhtml+xml',
   'zip' => 'application/zip',
   'au' => 'audio/basic',
   'snd' => 'audio/basic',
   'mid' => 'audio/midi',
   'midi' => 'audio/midi',
   'kar' => 'audio/midi',
   'mpga' => 'audio/mpeg',
   'mp2' => 'audio/mpeg',
   'mp3' => 'audio/mpeg',
   'wma' => 'audio/mpeg',
   'aif' => 'audio/x-aiff',
   'aiff' => 'audio/x-aiff',
   'aifc' => 'audio/x-aiff',
   'm3u' => 'audio/x-mpegurl',
   'ram' => 'audio/x-pn-realaudio',
   'rm' => 'audio/x-pn-realaudio',
   'rpm' => 'audio/x-pn-realaudio-plugin',
   'ra' => 'audio/x-realaudio',
   'wav' => 'audio/x-wav',
   'pdb' => 'chemical/x-pdb',
   'xyz' => 'chemical/x-xyz',
   'bmp' => 'image/bmp',
   'gif' => 'image/gif',
   'ief' => 'image/ief',
   'jpeg' => 'image/jpeg',
   'jpg' => 'image/jpeg',
   'jpe' => 'image/jpeg',
   'png' => 'image/png',
   'tiff' => 'image/tiff',
   'tif' => 'image/tiff',
   'djvu' => 'image/vnd.djvu',
   'djv' => 'image/vnd.djvu',
   'wbmp' => 'image/vnd.wap.wbmp',
   'ras' => 'image/x-cmu-raster',
   'pnm' => 'image/x-portable-anymap',
   'pbm' => 'image/x-portable-bitmap',
   'pgm' => 'image/x-portable-graymap',
   'ppm' => 'image/x-portable-pixmap',
   'rgb' => 'image/x-rgb',
   'xbm' => 'image/x-xbitmap',
   'xpm' => 'image/x-xpixmap',
   'xwd' => 'image/x-xwindowdump',
   'igs' => 'model/iges',
   'iges' => 'model/iges',
   'msh' => 'model/mesh',
   'mesh' => 'model/mesh',
   'silo' => 'model/mesh',
   'wrl' => 'model/vrml',
   'vrml' => 'model/vrml',
   'css' => 'text/css',
   'html' => 'text/html',
   'htm' => 'text/html',
   'asc' => 'text/plain',
   'txt' => 'text/plain',
   'rtx' => 'text/richtext',
   'rtf' => 'text/rtf',
   'sgml' => 'text/sgml',
   'sgm' => 'text/sgml',
   'tsv' => 'text/tab-separated-values',
   'wml' => 'text/vnd.wap.wml',
   'wmls' => 'text/vnd.wap.wmlscrīpt',
   'etx' => 'text/x-setext',
   'xsl' => 'text/xml',
   'xml' => 'text/xml',
   'mpeg' => 'video/mpeg',
   'mpg' => 'video/mpeg',
   'mpe' => 'video/mpeg',
   'qt' => 'video/quicktime',
   'mov' => 'video/quicktime',
   'mxu' => 'video/vnd.mpegurl',
   'avi' => 'video/x-msvideo',
   'movie' => 'video/x-sgi-movie',
   'wmv' => 'application/x-mplayer2',
   'ice' => 'x-conference/x-cooltalk',
  );
 
 function download($filepath='',$downname='')
 {
  if($filepath == '' AND !$this->filepath)
  {
   $this->ErrInfo = $this->_LANG['err'] . ':' . $this->_LANG['args_empty'];
   return false;
  }
  if($filepath == '') $filepath = $this->filepath;
  if(!file_exists($filepath))
  {
   $this->ErrInfo = $this->_LANG['err'] . ':' . $this->_LANG['file_not_exists'];
   return false;
  }
  if($downname == '' AND !$this->downname) $downname = $filepath;
  if($downname == '') $downname = $this->downname;
  // 文件扩展名
  $fileExt = substr(strrchr($filepath, '.'), 1);
  // 文件类型
  $fileType = $this->MIMETypes[$fileExt] ? $this->MIMETypes[$fileExt] : 'application/octet-stream';
  // 是否是图片
  $isImage = False;
  /*
  简述: getimagesize(), 详见手册
  说明: 判定某个文件是否为图片的有效手段, 常用在文件上传验证
  */
  $imgInfo = @getimagesize($filepath);
  if ($imgInfo[2] && $imgInfo['bits'])
  {
   $fileType = $imgInfo['mime'];  // 支持不标准扩展名
   $isImage = True;
  }
  // 显示方式
  if($this->is_attachment)
  {
   $attachment = 'attachment';  // 指定弹出下载对话框
  }
  else
  {
   $attachment = $isImage ? 'inline' : 'attachment';
  }
  // 读取文件
  if (is_readable($filepath))
  {
   /*
   简述: ob_end_clean() 清空并关闭输出缓冲, 详见手册
   说明: 关闭输出缓冲, 使文件片段内容读取至内存后即被送出, 减少资源消耗
   */
   ob_end_clean();
   /*
   HTTP头信息: 指示客户机可以接收生存期不大于指定时间(秒)的响应
   */
   header('Cache-control: max-age=31536000');
   /*
   HTTP头信息: 缓存文件过期时间(格林威治标准时)
   */
   header('Expires: ' . gmdate('D, d M Y H:i:s', time()+31536000) . ' GMT');
   /*
   HTTP头信息: 文件在服务期端最后被修改的时间
   Cache-control,Expires,Last-Modified 都是控制浏览器缓存的头信息
   在一些访问量巨大的门户, 合理的设置缓存能够避免过多的服务器请求, 一定程度下缓解服务器的压力
   */
   header('Last-Modified: ' . gmdate('D, d M Y H:i:s' , filemtime($filepath) . ' GMT'));
   /*
   HTTP头信息: 文档的编码(Encode)方法, 因为附件请求的文件多样化, 改变编码方式有可能损坏文件, 故为none
   */
   header('Content-Encoding: none');
   /*
   HTTP头信息: 告诉浏览器当前请求的文件类型.
   1.始终指定为application/octet-stream, 就代表文件是二进制流, 始终提示下载.
   2.指定对应的类型, 如请求的是mp3文件, 对应的MIME类型是audio/mpeg, IE就会自动启动Windows Media Player进行播放.
   */
   header('Content-type: ' . $fileType);
   /*
   HTTP头信息: 如果为attachment, 则告诉浏览器, 在访问时弹出”文件下载”对话框, 并指定保存时文件的默认名称(可以与服务器的文件名不同)
   如果要让浏览器直接显示内容, 则要指定为inline, 如图片, 文本
   */
   header('Content-Disposition: ' . $attachment . '; filename=' . $downname);
   /*
   HTTP头信息: 告诉浏览器文件长度
   (IE下载文件的时候不是有文件大小信息么?)
   */
   header('Content-Length: ' . filesize($filepath));
   // 打开文件(二进制只读模式)
   $fp = fopen($filepath, 'rb');
   // 输出文件
   fpassthru($fp);
   // 关闭文件
   fclose($fp);
   return true;
  }
  else
  {
   $this->ErrInfo = $this->_LANG['err'] . ':' . $this->_LANG['file_not_readable'];
   return false;
  }
 }
}
?>



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