Creare immagine captcha

[mcthepirate]

<?php
session_start();

if (isset($_SESSION['chiave'])) {

  header("Content-type: image/png");

  $string = $_SESSION['chiave'];

  $img = imagecreatefrompng("bg.png");

  $color = imagecolorallocate($img, 0, 90, 60);

  imagestring($img, rand(4,5), 15, 10, $string, $color);

  imagepng($img);

  imagedestroy($img);

}
?>