Graphics Php

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// output of 1 pixel transparent/colored gif
// syntax: for a transparent pixel
// or: for a yellow pixel
// 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");
// if # is in front of the hex-string
$rgb = str_replace("#", "", $c);
$r = hexdec(substr ($rgb, 0,2));
$g = hexdec(substr ($rgb, 2,2));
$b = hexdec(substr ($rgb, 4,2));
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);
}
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);
}
?>