PHP报告错误的MIME类型 [英] PHP reports incorrect MIME type

问题描述

我正在设计一个简单的PHP脚本，以允许上载* .cpp源文件.作为一种基本的安全措施，在将临时文件移到永久位置之前，我会先检查其MIME类型.在终端(在Mac OS X上)中运行file --mime myfile.cpp时，它显示为text/x-c.但是由于某种原因，服务器将其视为application/octet-stream.在/etc/mime.types中，在text/x-c++src下有"cpp"扩展名，这使我相信这是Mac上的MIME类型问题.

I am designing a simple PHP script to allow uploads of *.cpp source files. As a basic security measure, I check the MIME type of the temporary file before moving it to a permanent location. When I run file --mime myfile.cpp in Terminal (on Mac OS X) it shows up as text/x-c. Yet the server sees it as a application/octet-stream for some reason. In /etc/mime.types the "cpp" extension is there under text/x-c++src which leads me to believe it's an issue with MIME types on Mac.

我在Ubuntu上尝试了相同的过程，并且工作正常(显示为text/x-c++src).我在两台计算机上都使用Chrome.

I've tried the same procedure from Ubuntu and it works fine (it shows up as text/x-c++src). I am using Chrome on both computers.

这本身并不是一个编程问题，但是可能有一些我不熟悉的PHP技巧.

It's not exactly a programming question per se, but there may be some PHP trick to this that I'm not familiar with.

$temp_file=$_FILES["file"]["type"];
if(($temp_file!="text/x-c++src")||($temp_file!="text/x-c")) {
    echo "<p style=\"color:red;font-style:italic\">Please upload a valid C++ file.</p>";
}

推荐答案

$_FILES['userfile']['type']包含浏览器发送的MIME类型(在上传过程中).您可以使用它，但不能信任它.

The $_FILES['userfile']['type'] contains the mime-type which the browser sent (during the upload). You can use it, but you cannot trust it.

尝试使用以下方法从$_FILES['userfile']['tmp_name']获取哑剧类型:

Try getting the mime-type from $_FILES['userfile']['tmp_name'] using:

$mime = mime_content_type($tmp_name);
// or, as this is deprecated:
$info = new finfo(FILEINFO_MIME_TYPE);
$mime = $info->file($tmp_name);

或者，您可以通过strrchr($_FILES['userfile']['name'], '.')中原始文件名的扩展名进行猜测.

Or, you can guess by the original file-name's extension in strrchr($_FILES['userfile']['name'], '.').

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