title: Class not found error when trying to create an object
body: <p>Instead of:</p>
  
  <pre><code>$price = "356";
  $shipping = "0";
  $total_price = $shipping + $price;
  
  Price: &lt;?php echo number_format((float)$price, 2, '.', ''); ?&gt;
  Shipping: &lt;?php echo number_format((float)$shipping, 2, '.', ''); ?&gt;
  Total: &lt;?php echo number_format((float)$total_price, 2, '.', ''); ?&gt;
  </code></pre>
  
  <p>I want to use an object like this:</p>
  
  <pre><code>$price = "356";
  $shipping = "0";
  $total_price = $shipping + $price;
  
  $oformat = new number_format(2, '.', '');
  
  Price: &lt;?= $oformat-&gt;format( (float) $price ); ?&gt;
  Shipping: &lt;?= $oformat-&gt;format( (float) $shipping ); ?&gt;
  Total: &lt;?= $oformat-&gt;format( (float) $total_price ); ?&gt;
  </code></pre>
  
  <p>But I'm getting:</p>
  
  <p><code>Fatal error: Class 'number_format' not found in line...</code></p>
  
  <p>Why and how to do it properly?</p>