Close a session in php after 10 minutes

I have a system created in PHP with MSSQL, this system is public and anyone from around the world can see it, one of the things I need is to create a session to control some part of the system but now my problem is that sessions are giving me problems because the user could let the browser open and the session is still valid and the server at some point is hanging because is consuming many resources.

Is there any way to close the session after x period of time? I have been trying with the settings in the php.ini file but that not solve my problem, some other way to force this?

Thanks in advance for the help.
GeorgeTowersAsked:
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becraigCommented:
I had a similar situation before, all I did was restart the session on each page keeping the session variables and then set a session timeout.

e.g:

        $_SESSION['expire'] = $_SESSION['start'] + (1 *600);

So php takes the session start value and adds 600 seconds for a 10 minute timeout.
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GeorgeTowersAuthor Commented:
Thanks. I will do that.
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