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copied!<p>easiest and best way: use phps <a href="http://de.php.net/manual/de/book.session.php" rel="noreferrer">session-management</a> - every client is given an id, stored in a cookie (if enabled) or given as a get-variable on every link and form. (alternatively you could set a cookie on your own). but: this only "fingerprints" the browser - if the user changes his browser, deletes his cookies or whatever, you can't identify it anymore.</p> <p>identifying every client by ip is usually a bad idea and won't work. clients that use the same router will have the same ip's - clients connected through a proxy-pool could have another ip with every page load.</p> <p>if you need a solution that can't be manipulated by the client in an easy way, try to do a combination of the following, using all that are supported by the clients browser and compare them on each page-load:</p> <ul> <li>"normal" HTTP Cookies </li> <li>Local Shared Objects (Flash Cookies) </li> <li>Storing cookies in RGB values of auto-generated, force-cached PNGs using HTML5 Canvas tag to read pixels (cookies) back out </li> <li>Storing cookies in and reading out Web History </li> <li>Storing cookies in HTTP ETags </li> <li>Internet Explorer userData storage </li> <li>HTML5 Session Storage </li> <li>HTML5 Local Storage </li> <li>HTML5 Global Storage </li> <li>HTML5 Database Storage via SQLite</li> </ul> <p>there's an solution called <a href="http://samy.pl/evercookie/" rel="noreferrer">evercookie</a> that implements all of this</p>

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