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

Question

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.

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solution

$ch = curl_init ($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_exec ($ch);
                        
$content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
echo $content_type;

Thanks to Mario!

Answer 1

solution

$ch = curl_init ($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_exec ($ch);

$content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
echo $content_type;

Thanks to Mario!