php_下载

$filename = "文件 名.txt";

$content=file_get_contents('/uploads/sdfsaf.txt');//将文件读入字符串

$length=strlen($content);//取得字符串长度，即文件大小，单位是字节

$encoded_filename = rawurlencode($filename);//采用rawurlencode避免空格被替换为+

$ua = $_SERVER["HTTP_USER_AGENT"];//获取用户浏览器UA信息

 

header('Content-Type: application/octet-stream');//告诉浏览器输出内容类型，必须

header('Content-Encoding: none');//内容不加密，gzip等，可选

header("Content-Transfer-Encoding: binary" );//文件传输方式是二进制，可选

header("Content-Length: ".$length);//告诉浏览器文件大小，可选

 

if (preg_match("/MSIE/", $ua)) {//从UA中找到MSIE判断是IE

    header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');

} else if (preg_match("/Firefox/", $ua)) {//同理判断火狐

    header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"');

} else {//其他情况，谷歌等

    header('Content-Disposition: attachment; filename="' . $filename . '"');

}

echo $content;

function file_down($filepath, $filename = '') {

if(!$filename) $filename = basename($filepath);

if(is_ie()) $filename = rawurlencode($filename);

$filetype = fileext($filename);

$filesize = sprintf("%u", filesize($filepath));

if(ob_get_length() !== false) @ob_end_clean();

header('Pragma: public');

header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');

header('Cache-Control: no-store, no-cache, must-revalidate');

header('Cache-Control: pre-check=0, post-check=0, max-age=0');

header('Content-Transfer-Encoding: binary');

header('Content-Encoding: none');

header('Content-type: '.$filetype);

header('Content-Disposition: attachment; filename="'.$filename.'"');

header('Content-length: '.$filesize);

readfile($filepath);

exit;

}