Troubleshoot "Call to undefined function: exif_imagetype" error
On new hosting environments it may happen that you get an "Call to udefined function: exif_imagetype" error message. This can be caused by missing exif support for PHP (exif_imagetpye() is reading the first byte from a picture and is verifiying its signature).
If you are a Shared Hosting customer: Please get in touch with customer support.
If you are managing your very own cPanel server, please rebuild Apache using EasyApache while checking the exif checkbox in Exhaustive Option List.