How to prevent double login with one account?

Question

i am working on php language, i want to ensure that one id(username / account) is not login in more than one computer. how can it tobe possible?

the logic is like this, if one account login, he/she cannot login in other computer if he/she did not Logout first from his/her first computer.

if we make some "logic" in LOGOUT button, maybe i can handle it, but how if the computer shutted down? the session is deleted, without executing the "logic" in LOGOUT button.

Already asked here: http://stackoverflow.com/questions/1727919/how-to-prevent-multiple-logins-in-php-website — Caff3in3fr33, Aug 12 '14 at 03:04

score 1 · Answer 1 · answered Aug 12 '14 at 03:09

1

Just add some additional field to user DB. On login generate unical id into this field (server-sided), send it to user as cookie, for example. And when user performs some action-attempt, compare his cookie with value from DB.

answered Aug 12 '14 at 03:09

Markus_13

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How to prevent double login with one account?

1 Answers1