I'm trying create a login script that keeps the visitor loged in each time he/she visits the site, so they wouldn't need to log in each time. I cannot change php.ini to increase expiration time, which is at 0 right now, because I'm on a virtual hosting plan. Is there a way I can I cookie functions to set a variable to remember the visitor? Any other ideas about how I can keep people loged in across multiple visits?
If you mean the expiration time for Sessions then you can change that with this function: session_set_cookie_params( 3600 * 24 * 365 ) - in this example the session would be set to expire after 1 Year (3600 seconds * 24 hours * 365 days), also take a look at sessions in the PHP manual.
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That just lasts till the end of the execution of the script doesn't it?