Php where statement help.

Question i just though of while i was making this but with where statements do you make them like

where topic=$topic

or like this

where topic='$topic'

I dont care about the mysql_query stuff before it because i already know that i just need to know this.

It would be WHERE topic='$topic'.

...

another question i know how to insert the current timestamp thing to a database but i want to know how to make it a session. wouldnt it be like time() or something else

I'm not sure about making it a session. I think you'll have to probally use $_SESSION['time']=time();

...

i think i tried doing that but idk ill see if it works now and tell you