phpixel.php

<?php
/**
 * POWER PHLOGGER Shared Library
 * Pixel generation class
 *
 * output of 1 pixel transparent/color gif
 * call this file directly in an IMG-tag.
 * syntax: <img src="phpixel.php">          for a transparent pixel
 *     or: <img src="phpixel.php?c=FFFF00"> yellow
 *
 * @final
 * @package      lib
 * @author       Philip Iezzi <webmaster@phpee.com>
 * @author       original autor: Ulrich Babiak, Koeln 1999/11/30
 * @copyright    Copyright (c) 2000-2004 PHPEE.COM
 *
 * @version      $Id$
 */

$c = @$_GET['c'];

// some headers to prevent caching
Header("Content-type: image/gif");
Header("Expires: Wed, 11 Nov 1998 11:11:11 GMT");
Header("Cache-Control: no-cache");
Header("Cache-Control: must-revalidate");

// HEX -> RGB
$r = hexdec(substr($c, 0, 2));
$g = hexdec(substr($c, 2, 2));
$b = hexdec(substr($c, 4, 2));

// colored pixel
if(@$c){
	printf ("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c",
	71,73,70,56,57,97,1,0,1,0,128,0,0,$r,$g,$b,0,0,0,44,0,0,0,0,1,0,1,0,0,2,2,68,1,0,59);
// transparent pixel
} else {
	printf ("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%",
	71,73,70,56,57,97,1,0,1,0,128,255,0,192,192,192,0,0,0,33,249,4,1,0,0,0,0,44,0,0,0,0,1,0,1,0,0,2,2,68,1,0,59);
}
?>