Php e varie librerie.. Installazione

[ianstilo]

e allora perche' questo non va?

<?
ob_start();
session_start();

$font = "army.ttf";
$size = 39;
$text = $_SESSION['verification_image_text'];
if($text==""){
        echo "Error!";
}else{
$background = rand(1,2);
$angle = rand(-2,2);
$im = imagecreatefrompng("http://www.codeworld.it/images/security_images_backgrounds/bg" . $background . ".png");
$white = imagecolorallocate($im, 255,255,255);
$black = imagecolorallocate($im, 204,204,204);
// Display the image
header("Content-type: image/png");
imagettftext($im, $size, $angle, 35, $size, $black, $font, $text);
imagepng($im);
imagedestroy($im);
}
?>