Codice PHP:
<?
session_start();
$x = 200;
$y = 75;
//creaiamo la stringa random e criptiamola
$crypt = sha1(microtime() * mktime());
//preleviamo una porzione della stringa
$str = substr($crypt,0,6);
$code = $str;
$space = $x / (strlen($code)+1);
$img = imagecreatetruecolor($x,$y);
$bg = imagecolorallocate($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),$color,'Vera.ttf',$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)]);
}
$_SESSION['control'] = sha1($str);
header("Content-type: image/png");
imagepng($img);
?>
Rispondi quotando