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php/curl – get extension of image on remote server using headers

There is a form on my website that allows the upload of images from a remote server. When the user enters the link and submits, I want to check the file and make sure it’s the right extension before I copy it off to my server.

I tried to directly use exif_imagetype, but allow_url_fopen is not allowed on the server so need help. I think using curl will solve the problem, but I’m not sure how to get the image extension from the header.

Thanks in advanced!


solution

JavaScript

Thanks to Mario!

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Answer

solution

JavaScript

Thanks to Mario!

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