title: Does base64_encode gives unique data?
body: <p>Hi my question is that does base64_encode does unique data every time we run the script?</p>
  
  <p>Below is the code.</p>
  
  <pre><code>    &lt;?php
      $id = 1;
      echo base64_encode($id);
      ?&gt;
  </code></pre>
  
  <p>If it does not provide the unique data every time then what is the point in encoding the string and passing in url. Does that make url safe??</p>