title: Parse string and isolate float value after currency symbol
body: <p>I want to parse a currency from a string in PHP, I've had a look at <a href="http://php.net/manual/en/class.numberformatter.php">number formatter</a> but haven't got PHP 5.3 or the ability to add extensions.</p>
  
  <p>The currency will only exist once per string, and will be prefixed with a currency symbol, in my case the pound sign £. The currency may be in one of the following formats:</p>
  
  <pre><code>£0.90
  £100
  £100.10
  £1000
  </code></pre>
  
  <p>What would be the best method of achieving this?</p>
  
  <p><strong>Edit</strong></p>
  
  <p>Here is an example string:</p>
  
  <pre><code>Paid a bill £153.93
  </code></pre>
  
  <p>I want to get the currency value into an variable.</p>