how do we tell if a php program is secure or not?

hello,
I am using maillist program from http://www.webinsta.com/ on my website.
The website got hacked. I had to upload the files again to the server.

There is a security update for this script on the website.

SECURITY UPDATE
Download the latest version or open maillist/inc/initdb.php and put on line 2
if(isset($_GET['absolute_path']))
{
echo "no access from here !!";
exit;
}

Will this be enough or I should follow some other steps too to make the site secure.
How to make a php program secure?
LVL 3
soniyaAsked:
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dr_dedoCommented:
mosi guess u'll have to follow them, mostly they have tried everyting you'll try, and you'll never be hack proof, you just pray you are not hacked today, if this is a good company, then leave it to them, not more you can do!
0
 
Richard QuadlingSenior Software DeveloperCommented:
Follow their advice.
0
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