md5 is it unique

[monkeytooth]

I know this is most likely one of many simple questions that can be found semi easily. But I'm pressed for time. I have searched google, php.net, etc. But it only tells me how to make md5 hashes. Ok great that part I knew.

 

What I am curious of is, if I create a md5 hash and store it as a session a cookie, or an entry in a database for later comparison with something else. If I followed the same exact method of creating the variable for the session, with the same exact data, would it create the same exact hash as before or would it create a new hash that would be diffrent

 

example

 

$session_key =  md5('Name-of-Product'.'Price'.'Shipping');

$compare_key = md5('Name-of-Product'.'Price'.'Shipping');

 

for the example above I would initial hash the info for the $session_key

 

through a series of different actions the user will eventually end up sending the data through the site via some form of variable or another $_POST or $_GET what I am tempting to do is want to make sure that if i take the user provided data that it matches that of the session I created earlier by comparing the 2 hash strings..

[Alex]

It would be the same of course. md5 wouldn't be of very much use if the hashes changed.

[monkeytooth]

Like I said Im sure its a simple answer and one I could find easily. I just over all wanted confirmation of what I thought to be the case. You have done that, so I thank you :-)