XXVII. Image functions
You can use the image functions in PHP to get the size of
JPEG, GIF,
PNG, and SWF images, and if
you have the GD library (available at http://www.boutell.com/gd/) you will also be able to create
and manipulate images.
The format of images you are able to manipulate depend on the
version of gd you install, and any other libraries gd might need
to access those image formats. Versions of gd older than gd-1.6
support gif format images, and do not support png, where versions
greater than gd-1.6 support png, not gif.
In order to read and write images in jpeg format, you will need to
obtain and install jpeg-6b (available at
ftp://ftp.uu.net/graphics/jpeg/), and then recompile gd to
make use of jpeg-6b. You will also have to compile PHP with
--with-jpeg-dir=/path/to/jpeg-6b.
To add support for Type 1 fonts, you can install t1lib (available
at ftp://ftp.neuroinformatik.ruhr-uni-bochum.de/pub/software/t1lib/), and then add
--with-t1lib[=dir].