Why does php's file_get_contents incorrectly retrieve json files from xkcd?

Posted by hally on Stack Overflow See other posts from Stack Overflow or by hally
Published on 2011-01-21T16:47:09Z Indexed on 2012/07/08 3:16 UTC
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Filed under:

php

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JSON

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http-headers

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file-get-contents

In writing a PHP script to download xkcd comics, i incurred errors when trying to get specific comics (as opposed to the latest one). Specifically, pointing file_get_contents at the following url:

xkcd.com/$COMIC_NUM/info.0.json

inexplicably retrieved the xhtml version of the comic's page on xkcd.com, and not a JSON file. However, if i request the exact same url in my browser, the correct JSON file is downloaded. I'm not sure why this is happening, but i suspect it has something to do with the request headers being sent.

Please help! :S

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