phpimagemagick

get mime type and extension of image in variable or file without extension

I have telegram bot receiving a photo in webhook. I can download photo but not get file extension. How to get image extension and optionally mime-type from variable containing photo?

Solution

  • You can use the buffer method on an finfo instance to get the mime type of an arbitrary string blob if you don't want to write it to disk first:

    // Just a small image from http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever
$blob = base64_decode('R0lGODlhAQABAIABAP///wAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==');

$finfo = new finfo(FILEINFO_MIME);
echo $finfo->buffer($blob) . "\n";

// Result: image/gif; charset=binary

    Demo: https://3v4l.org/EJ95S