PHP, How can I retrieve a specific number?
<p>I need to retrieve itunes app id from the URL address.</p>

<p><a href="https://itunes.apple.com/us/app/angry-birds-star-wars/id557137623?mt=8" rel="nofollow">https://itunes.apple.com/us/app/angry-birds-star-wars/id557137623?mt=8</a></p>

<p>I used strpos(), but this one didn't work.</p>

<p>How can I get numbers after id from this address?</p>

<p>$url = 'https://itunes.apple.com/us/app/angry-birds-star-wars/id557137623?mt=8';</p>

<p>$result = '557137623'</p>

<p>result will be like this one. </p>
