Checking Mime-Type of External URL Using PHP

I was overwhelmed by Mime-Type while I was working for a project. The problem is I don’t know how to retrieve the mime-type from a file, particularly file from another host. This url is the one I want t check its mime-type. Why do I have to check it? Because it doesn’t have proper extension for an image. Look how it shows ‘?v=1423061058’ as its extension. What is it!!!??

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