This you can find in PHP-manual!
$argv
Array of arguments passed to the script.
When the script is run on the command line,
this gives C-style access to the command line parameters.
When called via the GET method, this will contain the query string.
Example:
Chapter 16. Creating and manipulating images
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.
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);
?>
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.
