.rar，.zip文件MIME类型

来自freedompeace，Kiyarash和Sam Vloeberghs的答案：

.rar    application/x-rar-compressed, application/octet-stream.zip    application/zip, application/octet-stream, application/x-zip-compressed, multipart/x-zip

我也会检查文件名。这是检查文件是RAR还是ZIP文件的方法。我通过创建一个快速的命令行应用程序对其进行了测试。

<?phpif (isRarOrZip($argv[1])) {    echo 'It is probably a RAR or ZIP file.';} else {    echo 'It is probably not a RAR or ZIP file.';}function isRarOrZip($file) {    // get the first 7 bytes    $bytes = file_get_contents($file, FALSE, NULL, 0, 7);    $ext = strtolower(substr($file, - 4));    // RAR magic number: Rar!x1Ax07x00    // http://en.wikipedia.org/wiki/RAR    if ($ext == '.rar' and bin2hex($bytes) == '526172211a0700') {        return TRUE;    }    // ZIP magic number: none, though PK0304, PK0506 (empty archive),     // or PK0708 (spanned archive) are common.    // http://en.wikipedia.org/wiki/ZIP_(file_format)    if ($ext == '.zip' and substr($bytes, 0, 2) == 'PK') {        return TRUE;    }    return FALSE;}

请注意，它仍然不能100％确定，但是可能已经足够好了。

$ rar.exe l somefile.zipsomefile.zip is not RAR archive

但是，即使WinRAR也会将非RAR文件检测为SFX存档：

$ rar.exe l somefile.srrSFX Volume somefile.srr