Check simplexml_load_file file to avoid warnings
<p>When calling an external API with simplexml_load_file a server timeout or similar will generate warnings. Using file_exists on e.g. <a href="http://www.api.com?query=xyz" rel="nofollow">http://www.api.com?query=xyz</a> does not work. Is there any built in function or appropriate solution for a  simple check before performing the simplexml_load_file?</p>
