With the Exif extension you are able to work with image meta data. For
example, you may use Exif functions to read meta data of pictures
taken from digital cameras by working with information stored in the
headers of the JPEG and TIFF images. [2][http://pterodactyl.l2p.net/
book/php5image/page/bi01.html#php_manual]
Contents Overview
Chapter 8, Installation and Configuration [http://pterodactyl.l2p.net/
book/php5image/page/ch08.html] contains detailed instructions on the
extension installation and runtime configuration.
Chapter 9, Functions [http://pterodactyl.l2p.net/book/php5image/page/
ch08.html] describes all functions defined in the extension.