问题
How can i check if the browser supports a specific mime type with php?
回答1:
You could analyze the Accept header field to see if the type or a superset of that type is listed.
But notice that Accept is a list of rated values and a quality value of 0 means not accepted. And browsers send different Accept values based on their expectations for that resource (e.g. a resource referenced in IMG element is expected to be an element of image/*).
来源：https://stackoverflow.com/questions/2171809/check-if-a-browser-supports-a-specific-mime-type