Question about using a standalone php - Joomla! Forum - community, help and support

hello,

this concerning security question of when use:
defined('_jexec') or die('restricted access');

i have third party standalone php script , wondering if need put defined('_jexec') or die('restricted access'); @ top of script.

also, have php file in directory of joomla site.

so question, need put in or concerns joomla files?

thank reading.

if going call php script directly can't put line because script won't work, since _jexec not defined outside joomla context.