title: PHP: Can I guarantee that date('s') will always return an unique value?
body: <p>Pardon me if something wrong in this question. May be it's a very dumb question but need to know exactly.</p>
  
  <pre><code>$t = date('s'); // s for second
  echo mkTime($t); // 1335629750
  </code></pre>
  
  <p>Will the above code always return an unique number, I thought it'll return me current timestamp (only second) and that is going to be unique for every users, am I wrong ? </p>
  
  <p>Thanks!</p>