Web scraping photo in PHP

How do I copy the url for the photo from the site if the url written in styles.

<div class="thumb">
               <a href="http://ift.tt/2oisie6" style="background:url(http://ift.tt/2ozpk17) no-repeat center center;background-size:cover">

<span class="thumb-overlay"></span></a>
 </div>