<?php
header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0"); // Keeps the browser from caching the image, causing the same thing to be shown every time
header("Pragma: no-cache"); // Also keeps the browser from caching
header("Content-type: image/png"); // Tells the browser it's showing a PNG image, not a whole web page

srand((double)microtime()*1000000); // Seeds the random number generator.  You don't need this if you're using PHP 4.2 or above
$rand = rand(0,1); // States that the variable 'rand' is a random number between 0 and 1.  You'll need to edit the 1 to your needs

if($rand == 0) // If the random number generated is 0...
{
    readfile("http://yoursite.com/images/signature0.jpg"); // ...show this file.  And yes, you can use .jpg, .gif, etc. even though we told the browser we're showing a .png image
}
elseif($rand == 1) // If the random number is 1...
{
    readfile("http://yoursite.com/images/signature1.png"); // ...show that file
}
?>

<?php
header('Content-type: image/png');
$user = $_GET['user'];
$im = imagecreatefrompng ("../madison/madison.png");

if ($user == "Shanebob"){
    $color = imagecolorallocate($im, 187, 0, 0);
    }
else if ($user == "OMENEMO"){
    $color = imagecolorallocate($im, 0, 122, 0);
    }
else {
    $color = imagecolorallocate($im, 0, 0, 0);
    }
    
$font = 'Arial.ttf';
$fontsize = 10;
$size = imagettfbbox($fontsize, 0, $font, $user); //calculate the pixel of the string
$dx = (imagesx($im)) - (abs($size[2]-$size[0])) - 20; //calculate the location to start the text
imageTTFtext ($im, $fontsize, 0, $dx, 13, $color, $font, $user);
imagepng($im);
imagedestroy($im);
?>