title: PHP: How to add russian ruble using number_format
body: <p>I am developing a shopping cart and displaying russian rubles using this number format:</p>
  
  <pre><code>number_format($price, 0, ',', ' ');//Example 15 525 instead of 15525
  </code></pre>
  
  <p>Now, when I add the subtotal with the shipping cost<br />
  For example:<br /></p>
  
  <p><strong>Subtotal</strong> :61 305 <br />
  <strong>Shipping</strong>:  8 250<br /><br />
  I get following result<br /><br />
  69 instead of 69 555<br /><br />
  How can I add them correctly using the number format above?</p>