php获取本地电脑文件后下载另存为

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

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$item=trim($_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

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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

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/**  * 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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