< ?php
header("Content-type: image/png");

$x = 200;
$y = 75;
$code = substr($_GET['code'],0,9);
$space = $x / (strlen($code)+1);



$img = imagecreatetruecolor($x,$y);

Usiamo la funzione imagecreatetruecolor() per creare il riquadro con 256 toni di rosso, verde e blu (da 0 a 255).



$bg = imagecolorallocate($img,255,255,255);
$border = imagecolorallocate($img,0,0,0);
$colors[] = imagecolorallocate($img,128,64,192);
$colors[] = imagecolorallocate($img,192,64,128);
$colors[] = imagecolorallocate($img,108,192,64);



imagefilledrectangle($img,1,1,$x-2,$y-2,$bg);
imagerectangle($img,0,0,$x-1,$y-2,$border);



for ($i=0; $i< strlen ($code); $i++)
{
$color = $colors[$i % count($colors)];
imagettftext($img,28+rand(0,8),-20+rand(0,40),($i+0.3)*$space,50+rand(0,10),$color,'alba.ttf',$code{$i});
}



for($i=0;$i<400;$i++)
{
$x1 = rand(3,$x-3);
$y1 = rand(3,$y-3);
$x2 = $x1-2-rand(0,8);
$y2 = $y1-2-rand(0,8);
imageline($img,$x1,$y1,$x2,$y2,$colors[rand(0,count($colors)-1)]);
}



imagepng($img);
?>