PHP something not working with session on mobile -


i've got login form creates session named "member" user's id when logs in. on each page, have 

if(!isset($_session["member"]) || empty($_session["member"])) { header("location: http://www.website.com/login"); die(); } else { show page }

this works fine on laptops , desktops when log in via mobile or tab, bring me menu page. other links click on menu page result in redirecting me login page. i've tried 20 times on few days , managed log in 3 times

what seems problem?

also, @ moment kill session when user clicks logout. ok? or should have calculate inactivity? (if user inactive 30 minutes, session timeout) if so, script enough if have on menu page or have on every page? thanks


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