ci-bonfire / Sprint

		 * Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the

		 * more convenient FILEINFO_MIME_TYPE flag doesn't exist.

		 */

		if (function_exists('finfo_file'))

		{

			$finfo = @finfo_open(FILEINFO_MIME);

			if (is_resource($finfo)) // It is possible that a FALSE value is returned, if there is no magic MIME database file found on the system

			{

				$mime = @finfo_file($finfo, $file['tmp_name']);

				finfo_close($finfo);

				/* According to the comments section of the PHP manual page,

				 * it is possible that this function returns an empty string

				 * for some files (e.g. if they don't exist in the magic MIME database)

				 */

				if (is_string($mime) && preg_match($regexp, $mime, $matches))

				{

					$this->file_type = $matches[1];

					return;

				}

			}

		}

		/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,

		 * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it

			if (function_usable('popen'))

			{

				$proc = @popen($cmd, 'r');

				if (is_resource($proc))

				{

					$mime = @fread($proc, 512);

					@pclose($proc);

					if ($mime !== FALSE)

					{

						$mime = explode("\n", trim($mime));

						if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))

						{

							$this->file_type = $matches[1];

							return;

						}

					}

				}

			}

		}