这是从imap服务器下载附件文件的代码。几乎所有文件类型（pdf，doc，xls等）都正确下载，而某些zip文件会出现以下错误：
“存档格式未知或已损坏”
代码：
//data from imap server
$name = "xyz 123.zip";
$type = "APPLICATION";
$subtype = "ZIP";
$encoding = "BASE64";
$body = imap_base64($data);
header('Content-Description: File Transfer');
header('Content-Type: '. $type .'/'. $subtype);
header('Content-Disposition: attachment; filename='.$name);
header('Content-Transfer-Encoding: '.$encoding);
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
ob_clean();
flush();
echo $body;
此外，如果我回显数据并使用以下内容将其转换为文件：
http://www.motobit.com/util/base64-decoder-encoder.asp
正在正确下载文件。因此从服务器获取文件没有问题。 我哪里错了？
答案 0 :(得分：5)
以zip格式下载文件的脚本： 的 zip.php
<?php
/**
* Zip file creation class.
* Makes zip files.
*
* Last Modification and Extension By :
*
* Hasin Hayder
* HomePage : www.hasinme.info
* Email : countdraculla@gmail.com
* IDE : PHP Designer 2005
*
*
* Originally Based on :
*
* http://www.zend.com/codex.php?id=535&single=1
* By Eric Mueller <eric@themepark.com>
*
* http://www.zend.com/codex.php?id=470&single=1
* by Denis125 <webmaster@atlant.ru>
*
* a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
* date and time of the compressed file
*
* Official ZIP file format: http://www.pkware.com/appnote.txt
*
* @access public
*/
class zipfile
{
/**
* Array to store compressed data
*
* @var array $datasec
*/
var $datasec = array();
/**
* Central directory
*
* @var array $ctrl_dir
*/
var $ctrl_dir = array();
/**
* End of central directory record
*
* @var string $eof_ctrl_dir
*/
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
/**
* Last offset position
*
* @var integer $old_offset
*/
var $old_offset = 0;
/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes, time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
function unix2DosTime($unixtime = 0) {
$timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
if ($timearray['year'] < 1980) {
$timearray['year'] = 1980;
$timearray['mon'] = 1;
$timearray['mday'] = 1;
$timearray['hours'] = 0;
$timearray['minutes'] = 0;
$timearray['seconds'] = 0;
} // end if
return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
} // end of the 'unix2DosTime()' method
/**
*
* Function to force the download of the archive as soon as it is created
*
* @param archiveName string - name of the created archive file
* @access public
* @return ZipFile via Header
*/
public function forceDownload($archiveName) {
if(ini_get('zlib.output_compression')) {
ini_set('zlib.output_compression', 'Off');
}
// Security checks
if( $archiveName == "" ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> The download file was NOT SPECIFIED.</body></html>";
exit;
}
elseif ( ! file_exists( $archiveName ) ) {
echo "<html><title>Public Photo Directory - Download </title><body><BR><B>ERROR:</B> File not found.</body></html>";
exit;
}
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: application/zip");
header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($archiveName));
readfile("$archiveName");
}
/**
* Adds "file" to archive
*
* @param string file contents
* @param string name of the file in the archive (may contains the path)
* @param integer the current timestamp
*
* @access public
*/
function addFile($data, $name, $time = 0)
{
$name = str_replace('\\', '/', $name);
$dtime = dechex($this->unix2DosTime($time));
$hexdtime = '\x' . $dtime[6] . $dtime[7]
. '\x' . $dtime[4] . $dtime[5]
. '\x' . $dtime[2] . $dtime[3]
. '\x' . $dtime[0] . $dtime[1];
eval('$hexdtime = "' . $hexdtime . '";');
$fr = "\x50\x4b\x03\x04";
$fr .= "\x14\x00"; // ver needed to extract
$fr .= "\x00\x00"; // gen purpose bit flag
$fr .= "\x08\x00"; // compression method
$fr .= $hexdtime; // last mod time and date
// "local file header" segment
$unc_len = strlen($data);
$crc = crc32($data);
$zdata = gzcompress($data);
$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
$c_len = strlen($zdata);
$fr .= pack('V', $crc); // crc32
$fr .= pack('V', $c_len); // compressed filesize
$fr .= pack('V', $unc_len); // uncompressed filesize
$fr .= pack('v', strlen($name)); // length of filename
$fr .= pack('v', 0); // extra field length
$fr .= $name;
// "file data" segment
$fr .= $zdata;
// "data descriptor" segment (optional but necessary if archive is not
// served as file)
$fr .= pack('V', $crc); // crc32
$fr .= pack('V', $c_len); // compressed filesize
$fr .= pack('V', $unc_len); // uncompressed filesize
// add this entry to array
$this -> datasec[] = $fr;
// now add to central directory record
$cdrec = "\x50\x4b\x01\x02";
$cdrec .= "\x00\x00"; // version made by
$cdrec .= "\x14\x00"; // version needed to extract
$cdrec .= "\x00\x00"; // gen purpose bit flag
$cdrec .= "\x08\x00"; // compression method
$cdrec .= $hexdtime; // last mod time & date
$cdrec .= pack('V', $crc); // crc32
$cdrec .= pack('V', $c_len); // compressed filesize
$cdrec .= pack('V', $unc_len); // uncompressed filesize
$cdrec .= pack('v', strlen($name) ); // length of filename
$cdrec .= pack('v', 0 ); // extra field length
$cdrec .= pack('v', 0 ); // file comment length
$cdrec .= pack('v', 0 ); // disk number start
$cdrec .= pack('v', 0 ); // internal file attributes
$cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
$cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
$this -> old_offset += strlen($fr);
$cdrec .= $name;
// optional extra field, file comment goes here
// save to central directory
$this -> ctrl_dir[] = $cdrec;
} // end of the 'addFile()' method
/**
* Dumps out file
*
* @return string the zipped file
*
* @access public
*/
function file()
{
$data = implode('', $this -> datasec);
$ctrldir = implode('', $this -> ctrl_dir);
return
$data .
$ctrldir .
$this -> eof_ctrl_dir .
pack('v', sizeof($this -> ctrl_dir)) . // total # of entries "on this disk"
pack('v', sizeof($this -> ctrl_dir)) . // total # of entries overall
pack('V', strlen($ctrldir)) . // size of central dir
pack('V', strlen($data)) . // offset to start of central dir
"\x00\x00"; // .zip file comment length
} // end of the 'file()' method
/**
* A Wrapper of original addFile Function
*
* Created By Hasin Hayder at 29th Jan, 1:29 AM
*
* @param array An Array of files with relative/absolute path to be added in Zip File
*
* @access public
*/
function addFiles($files /*Only Pass Array*/)
{
foreach($files as $file)
{
if (is_file($file)) //directory check
{
$data = implode("",file($file));
$new_file = $this->prefix_name.end(explode('/', $file));
$this->addFile($data, $new_file);
}
}
}
/**
* A Wrapper of original file Function
*
* Created By Hasin Hayder at 29th Jan, 1:29 AM
*
* @param string Output file name
*
* @access public
*/
function output($file)
{
$fp=fopen($file,"w");
fwrite($fp,$this->file());
fclose($fp);
}
} // end of the 'zipfile' class
?>
使用示例：
<?php
include_once('zip.php');
$zip_file = 'my_files.zip'; // name for downloaded zip file
$ziper = new zipfile();
$ziper->prefix_name = 'folder/'; // here you create folder which will contain downloaded files
$ziper->addFiles($files_to_zip); // array of files
$ziper->output($zip_file);
$ziper->forceDownload($zip_file);
@unlink($zip_file);
?>
答案 1 :(得分：1)
我可能会有点迟到，但我面临同样的问题，这些线条对我来说就像一个魅力
while (ob_get_level()) {
ob_end_clean();
}
答案 2 :(得分：0)
罪魁祸首是imap_base64。它没有正确解码数据。我用base64_decode替换它如下，代码工作正常。
$body = base64_encode($data);
答案 3 :(得分：0)
你非常接近解决方案！我发现解决这个问题的方法是一起删除Content-type标头，让浏览器知道这是一个.zip文件。删除Content-Type，它应该根据需要工作。
// Remove this line
header('Content-Type: '. $type .'/'. $subtype);
在我的控制台（Chrome）中，我收到一条奇怪的消息：
资源解释为文档但使用MIME类型application / octet-stream传输：
资源被解释为文档但使用MIME类型application / zip传输：
当我删除MIME类型（内容类型标题）时，.zip停止给我一个错误并且正常工作。
使.zip工作的最基本的下载脚本在最后看起来像这样:(注意：您仍然可以为缓存添加更多标题等）
<?php
header("Content-Disposition: attachment; filename=\"".$Filename."\"");
header("Content-Length: ".filesize($Filename));
readfile($Filename);
?>
<强>被修改
如果浏览器正在读取额外的空格，您的.zip也会遇到问题。您可以通过添加exit（）来阻止readfile（）末尾的额外空格;但是你要确保你在文件的开头没有任何空格。这在处理框架（尤其是您自己的框架）时尤为常见。一个小技巧：如果在缓冲区开始输出HTML之前包含所有函数，配置和类，请查看源代码。在开始时，会有一个空格。
答案 4 :(得分：0)
It Worked For Me. It Download My .Zip File. But, you have to provide the full path of File, where it is located.
For ex: My File is inside assets/upload Folder. Attach name of that file with this location. You will download it without any problem.
$FilePaths='assets/Upload/'.$FileName; //Give proper file path with file name.
download_file($FilePaths);
function download_file( $fullPath )
{
if( headers_sent() )
die('Headers Sent');
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
if( file_exists($fullPath) )
{
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext)
{
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
default: $ctype="application/force-download";
}
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false);
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$fsize);
ob_clean();
flush();
readfile( $fullPath );
}
else
die('File Not Found');
}
有关详情，请查看File Download
答案 5 :(得分：0)
我还没有看到有人提到这一点，但在下载ZIP文件时尝试删除Content-Length标头。我有这个完全相同的问题，它适用于
答案 6 :(得分：-1)
这对于大文件下载非常有用。用户将立即收到文件。也许zip也是这样的。
if(file_exists($filename) && is_readable($filename) && file_exists($filename)){
header("Content-Disposition: attachment; filename=".basename(str_replace(' ', '_', $filename)));
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");
header("Content-Length: " . filesize($filename));
flush(); // this doesn't really matter.
$fp = fopen($filename, "r");
while (!feof($fp))
{
echo fread($fp, 65536);
flush(); // this is essential for large downloads
}
fclose($fp);
exit;
}