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In my php application, I’m using $_SESSION to track whether a user is logged in. If a user leaves any page on my site at http://mysite.com and goes to http://someotherwebsite.com, I want to automatically log them out, such that if they return to any page on http://mysite.com, they need to login again.
Is there an easy way to do this?
You cannot explicitly tell when an user leaves your site, your best bet would to be to implement a timeout on your sessions.
As most of the answers have said, you could check with the JavaScript event
onbeforeunloadbut the user can by-pass this by disabling JavaScript or, as BalusC had pointed out, using a web browser that does not support it, such as Opera.Therefore, I strongly believe implementing a timeout on your sessions is the best way to force a logout.