PHP强制在Internet Explorer中下载文件失败

Question

I have a site where I'm using the following code to force a file download via PHP:

$ZipData = file_get_contents($zipFilename);
$ZipSize = filesize($zipFilename);
header("Content-type: application/octet-stream");
header("Content-disposition: attachment; filename=".$ZipTitle.".zip");
echo $ZipData;

While this works perfectly in Chrome and Firefox, it simply does nothing in Internet Explorer. While Googling I found a potential solution and changed the code to as follows:

$ZipData = file_get_contents($zipFilename);
$ZipSize = filesize($zipFilename);
if (strstr($HTTP_USER_AGENT,"MSIE")){
    header("Pragma: public");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Content-type: application-download");
    header("Content-Length: $ZipSize");
    header("Content-disposition: attachment; filename=".$ZipTitle.".zip");
    header("Content-Transfer-Encoding: binary");
}else{
    header("Content-type: application/octet-stream");
    header("Content-disposition: attachment; filename=".$ZipTitle.".zip");
}
echo $ZipData;

But still no luck. I don't know why it's failing, nor where to start looking for errors or problems, is this just some IE bug I'm unaware of? Where should I start trying to find a solution?

Note: $ZipTitle will always be 'TexturePacker_Pack_xxx' where xxx is an incremented number. $ZipFilename is an existing zip file which is unlinked AFTER the file is sent to the browser.

Edit: The site and code in question are in action on http://www.texturepacker.net

Answer 1

Your Content-Length header seems to be incorrect. PHP filesize expects a string and returns an int.

Change it to actually get the size of the file on disk:

$zipFile = "C:\ZipFile.zip";  
header("Content-Length: " . filesize($ZipFile));