在php中下載文件我們用得最多的是直接使用readfile()函數，readfile()可以實現把服務器源文件給下載，下面我來給大家介紹readfile下載文件的方法與性能介紹
例1
代碼如下 復制代碼<?php
header(“Content-Type: text/html; charset=UTF-8″);
header(“Content-type:application/text”);
// 文件將被稱為 downloaded.pdf
header(“Content-Disposition:attachment;filename=log.text”);
// PDF 源在 original.pdf 中
readfile(“ptindex_user_profilebasc.html”);
?>
例2
代碼如下 復制代碼
$item=trim($_GET['fileName']).".txt";
$abs_item='/usr/home/文件夾名稱/文件夾名稱/文件夾名稱/'.$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);
上面只能下載本地函數，如果要下載遠程的我們可以如下操作PHP遠程下載文件到本地的函數
代碼如下 復制代碼<?php
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;
}
}
}
?>
最後分享一個支持多種文件下載的類函數
代碼如下 復制代碼<?php
/**
* 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' => '錯誤',
'args_empty' => '參數錯誤。',
'file_not_exists' => '文件不存在！',
'file_not_readable' => '文件不可讀！',
);
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;
// 文件擴展名
$fileExt = substr(strrchr($filepath, '.'), 1);
// 文件類型
$fileType = $this->MIMETypes[$fileExt] ? $this->MIMETypes[$fileExt] : 'application/octet-stream';
// 是否是圖片
$isImage = False;
/*
簡述: getimagesize(), 詳見手冊
說明: 判定某個文件是否為圖片的有效手段, 常用在文件上傳驗證
*/
$imgInfo = @getimagesize($filepath);
if ($imgInfo[2] && $imgInfo['bits'])
{
$fileType = $imgInfo['mime']; // 支持不標准擴展名
$isImage = True;
}
// 顯示方式
if($this->is_attachment)
{
$attachment = 'attachment'; // 指定彈出下載對話框
}
else
{
$attachment = $isImage ? 'inline' : 'attachment';
}
// 讀取文件
if (is_readable($filepath))
{
/*
簡述: ob_end_clean() 清空並關閉輸出緩沖, 詳見手冊
說明: 關閉輸出緩沖, 使文件片段內容讀取至內存後即被送出, 減少資源消耗
*/
ob_end_clean();
/*
HTTP頭信息: 指示客戶機可以接收生存期不大於指定時間（秒）的響應
*/
header('Cache-control: max-age=31536000');
/*
HTTP頭信息: 緩存文件過期時間(格林威治標准時)
*/
header('Expires: ' . gmdate('D, d M Y H:i:s', time()+31536000) . ' GMT');
/*
HTTP頭信息: 文件在服務期端最後被修改的時間
Cache-control,Expires,Last-Modified 都是控制浏覽器緩存的頭信息
在一些訪問量巨大的門戶, 合理的設置緩存能夠避免過多的服務器請求, 一定程度下緩解服務器的壓力
*/
header('Last-Modified: ' . gmdate('D, d M Y H:i:s' , filemtime($filepath) . ' GMT'));
/*
HTTP頭信息: 文檔的編碼(Encode)方法, 因為附件請求的文件多樣化, 改變編碼方式有可能損壞文件, 故為none
*/
header('Content-Encoding: none');
/*
HTTP頭信息: 告訴浏覽器當前請求的文件類型.
1.始終指定為application/octet-stream, 就代表文件是二進制流, 始終提示下載.
2.指定對應的類型, 如請求的是mp3文件, 對應的MIME類型是audio/mpeg, IE就會自動啟動Windows Media Player進行播放.
*/
header('Content-type: ' . $fileType);
/*
HTTP頭信息: 如果為attachment, 則告訴浏覽器, 在訪問時彈出”文件下載”對話框, 並指定保存時文件的默認名稱(可以與服務器的文件名不同)
如果要讓浏覽器直接顯示內容, 則要指定為inline, 如圖片, 文本
*/
header('Content-Disposition: ' . $attachment . '; filename=' . $downname);
/*
HTTP頭信息: 告訴浏覽器文件長度
(IE下載文件的時候不是有文件大小信息麼?)
*/
header('Content-Length: ' . filesize($filepath));
// 打開文件(二進制只讀模式)
$fp = fopen($filepath, 'rb');
// 輸出文件
fpassthru($fp);
// 關閉文件
fclose($fp);
return true;
}
else
{
$this->ErrInfo = $this->_LANG['err'] . ':' . $this->_LANG['file_not_readable'];
return false;
}
}
}
?>
