kenjis / ci-phpunit-test

		// Fileinfo extension - most reliable method

		$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

				? 'file --brief --mime '.escapeshellarg($file['tmp_name']).' 2>&1'

				: 'file --brief --mime '.$file['tmp_name'].' 2>&1';

			if (function_usable('exec'))

			{

				/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.

				 * However, we only need the last line, which is the actual return value of exec(), and as such - it overwrites

				 * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy

				 * value, which is only put to allow us to get the return status code.

				 */

				$mime = @exec($cmd, $mime, $return_status);

				if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches))

				{

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

					return;

				}

			}

			if ( ! ini_get('safe_mode') && function_usable('shell_exec'))

			{