PHP is not limited to creating just HTML output. It can also be used to create and
manipulate image files in a variety of different image formats, including gif, png, jpg, wbmp, and
xpm. Even more convenient, php can output image streams directly to a browser. You will need to
compile PHP with the GD library of image functions for this to work. GD and PHP may also require
other libraries, depending on which image formats you want to work with. GD stopped supporting Gif
images in version 1.6.
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Example 16-1. PNG creation with PHP
<?php
Header("Content-type: image/png");
$string=implode($argv," ");
$im = imageCreateFromPng("images/button1.png");
$orange = ImageColorAllocate($im, 220, 210, 60);
$px = (imagesx($im)-7.5*strlen($string))/2;
ImageString($im,3,$px,9,$string,$orange);
ImagePng($im);
ImageDestroy($im);
?>
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This example would be called from a page with a tag like: <img src="button.php?text"> The
above button.php script then takes this "text" string an overlays it on top of a base image which
in this case is "images/button1.png" and outputs the resulting image. This is a very convenient way
to avoid having to draw new button images every time you want to change the text of a button. With
this method they are dynamically generated.
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