php what is the best way to distinguish users
<p>I'm building a PHP voting system, and I want to limit the number of votes per user.</p>

<p>So what is the best way to distinguish users on my website?</p>

<p>I can track them by cookies or sessions but this doesn't seem efficient because if a user deletes his cookies he will pass the security test. I know there will not be a 100% solution but I want to follow the best practice here.</p>

<p>Any help?</p>
