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PHP TIPS:
Installing Required Graphics Libraries
The GD library is the most critical component that you need to install before you in create an image in PHP. If you have already installed the GD library on your computer, then you can move to the next section.
You can check if the library is installed on your computer by opening the phpinfo.php file in your browser and checking if the gd section exists. If the section appears in the Web page, then rest assured that the GD library is already installed on your system. However, if it's not installed, you can download the library from the PHP Web site. Detailed instructions on how to install this package are also available at the site.
The installation procedure of the GD library is simple. You need to execute the following commands once you have downloaded the file from the Web. Remember that you need to be logged in as the root to install the package.
./configure
make.
make install
CAUTION
The versions of GO earlier than 1.6 provide support for both GIF and JPEG formats, while the versions after 1.6 provide support for JPEG and PNG. You need to install the version of GD based on your requirement.
The GD library provides a number of functions that you can use in PHP to create different shapes, to change colors, and to create shapes filled with colors. Other libraries that you need to install are the zlib library and the PNG library. The zlib library is available at and the PNG library is available at a PHP Web site, and the Free Type font is available at http://freetype.sourceforge.net.
Let's now look at some of the functions provided by PHP that you could use while writing codes for creating dynamic images in PHP.