getid3_lib::truepath

			} else {
				$commandline = 'for %I in ('.escapeshellarg($path).') do @echo %~zI';
			}
		} else {
			$commandline = 'ls -l '.escapeshellarg($path).' | awk \'{print $5}\'';
		}
		if (isset($commandline)) {
			$output = trim(`$commandline`);
			if (ctype_digit($output)) {
				$filesize = (float) $output;
			}
		}
		return $filesize;
	}

	/**
	 * @param string $filename
	 *
	 * @return string|false
	 */
	public static function truepath($filename) {
		// 2017-11-08: this could use some improvement, patches welcome
		if (preg_match('#^(\\\\\\\\|//)[a-z0-9]#i', $filename, $matches)) {
			// PHP's built-in realpath function does not work on UNC Windows shares