url variable help

[Anon]

ok, I have got a game of checkers built primarily out of PHP. I use an <a href> around the pictures to allow users to click on the checker of their choice. In that URL I store all the information about the next pages board layout (so the URL is filled with a lot of variables tacked on to it). The problem is, that if a user wanted to cheat, they could just change the variables in the url by hand. My question is, is there a way to prevent this from happening (the cheating), and still use my hrefs with the variables tacked on to it? If not, how would you do such a thing? thanx in advance.

[Anon]

You can use sessions!

If you need more info about sessions, check in the articels of this website😃

[Anon]

yes, but if I use sessions, and still want to use an href with all the variables stuck to the end of it. when I click that href it will go to the next screen. Then on the next screen you have a URL like this:

http://www.whatever.net/~wrx/testing/checkersboardtest2.php?start=no&setUp=1&checkN=20&move=0&temp=5&stay=&jumper=0&tempcol=&tempcheck=&tempcfirst=&holder=0&clast=0&cfirst=0&positionlast=0&p1email=&p2email=&a1=2&a2=2&a3=2&a4=2&b1=2&b2=2&b3=2&b4=2&c1=2&c2=2&c3=2&c4=2&d1=0&d2=0&d3=0&d4=0&e1=0&e2=0&e3=0&e4=0&f1=1&f2=1&f3=1&f4=1&g1=1&g2=1&g3=1&g4=1&h1=1&h2=1&h3=1&h4=1&player=1

If I register the variables at the beginning of the page, will it not use the variables in the URL to register them? Basically, I am asking if I change "al=2" inside the URL to "al=3" inside the URL and press ENTER, won't PHP just register "al=3"??? I may be missing something here though . . .

[Anon]

nevermind, I think I have it, thanx.