title: Why does the `FILTER_VALIDATE_NUMBER_FLOAT` constant drop the decimal place character?
body: <pre><code>$quantity = filter_input(INPUT_GET, 'quantity', FILTER_SANITIZE_NUMBER_FLOAT);
  </code></pre>
  
  <p>Input: <code>100.25</code></p>
  
  <p>Output: <code>10025</code></p>
  
  <p>How can I preserve the <code>.</code> character?</p>