Hey, I need simple code that will check logged users, for example
I need to make site that hold students and each student can see some classes depending on what college he is on, so site is not really problem, nor database is, just that code that checks student and his college, and shows him classes that fits him.
Thanks in advance
Wishing you the best in your coding endeavor. 
Well, filip, your question was very vague. It really did not ask a question or show any code
for us to help with. Therefore, it is very hard for us to help you. But, if you are in a class and
just learning PHP, SQL and HTML, you should read your books. If you are not in a class and
learning on your own, you might want to start with this site below. It has a large number of
simple to understand tutorials and will help you learn the basics. Then, you can come back
here when you get stuck and place your code into the PHP tags and we can help.
http://www.w3schools.com/html/html_forms.asp
On the left side, you can select various areas to learn what you would need.
Hope this helps.