/**
* Attempt to detect the MIME type of a file using available extensions
*
* This method will try to detect the MIME type of a file. If the fileinfo
* extension is available, it will be used. If not, the mime_magic
* extension which is deprected but is still available in many PHP setups
* will be tried.
*
* If neither extension is available, the default application/octet-stream
* MIME type will be returned
*
* @param string $file File path
* @return string MIME type
*/
protected function _detectFileMimeType($file)
{
$type = null;
// First try with fileinfo functions
if (function_exists('finfo_open')) {
if (self::$_fileInfoDb === null) {
self::$_fileInfoDb = @finfo_open(FILEINFO_MIME);
}
if (self::$_fileInfoDb) {
$type = finfo_file(self::$_fileInfoDb, $file);
}
} elseif (function_exists('mime_content_type')) {
$type = mime_content_type($file);
}
// Fallback to the default application/octet-stream
if (!$type) {
$type = 'application/octet-stream';
}
return $type;
}