How to fetch youtube video data using php?

I need to get the XML data from youtube for a particular video(based on ID) and fetch the thumbnail url. I am using PHP. The code is as follows:

<?php

//$xmlFilePath = 'http://localhost/testFile.xml'; //This works..
$xmlFilePath = 'https://gdata.youtube.com/feeds/api/videos/5P6UU6m3cqk?v=2';

$dataFromYoutube = file_get_contents($xmlFilePath);
print_r($dataFromYoutube);
?>

I dont get any data. The output is blank. If I load开发者_开发百科 the url 'https://gdata.youtube.com/feeds/api/videos/5P6UU6m3cqk?v=2' in browser and copy the content to a file(http://localhost/testFile.xml), then the above code works. I have tried fetching the youtube data using ajax and also simlexml_load_file function in php. But the result is blank/empty for Youtube url. However, I get the data for 'http://localhost/testFile.xml' in both cases. How can I fetch youtube data using php?

Please help.

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well, your code is correct and works fine too. It may be that your apache server is not configured for "https". So just check it once too.