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    <p>So you want a "Remember me on this computer" option? Here's a language-agnostic way how you can do it:</p> <ol> <li>Create a DB table with at least <code>cookie_id</code> and <code>user_id</code> columns. If necessary also add a <code>cookie_ttl</code> and <code>ip_lock</code>. The column names speaks for itself I guess.</li> <li>On first-time login (if necessary only with the "Remember me" option checked), generate a long, unique, hard-to-guess key which represents the <code>cookie_id</code> and store this in the DB along with the <code>user_id</code>. Also store this as cookie value of a cookie with a before specified cookie name. E.g. <code>remember</code>. Give the cookie a long lifetime, e.g. one year.</li> <li>On every request, check if the user is logged in. If not, then check the cookie value <code>cookie_id</code> associated with the cookie name <code>remember</code>. If it is there and it is valid according the DB, then automagically login the user associated with the <code>user_id</code> and postpone the cookie age again.</li> </ol> <p>As to the security risks, if the key is long and mixed enough (at least 30 mixed chars), then the chances on brute-forcing the login are negligible. Further on you probably already understood what the optional column <code>ip_lock</code> is to be used for. It should represent the IP address of the user. You could eventually add an extra checkbox "Lock login to this IP (only if you have a static IP)" so that the server can use the user's IP address as an extra validation. </p> <p>And what if one hijacked the cookie value from an user without an IP lock? Well, there's not much to do against this. Live with it. The "remember me" thing is funny for under each forums and account-hijacks wouldn't hurt that much there, but I would certainly not use it for admin panels and that kind of webpages which controls the server-side stuff.</p> <p>It's after all fairly straight forward. Good luck.</p>
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    1. POkeep user logged in when he visit the same page again?
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    1. COI think it would be a good idea to store users-agent in a database, because it is pretty illogical that the same user will want to be remembered in both IE and firefox. In fact everything that can be mined from request should be stored in order to prevent cookie stealing, shouldn't it?..
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    2. CODoable, but it would fail if the user upgraded the UA.
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    3. COWell is way better for user to enter his details again, than for an intruder to get his access.
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