Captcha problem -headers (Opgelost)

<?php
header("Content-Type: image/png");
$img = imagecreatetruecolor(75,30);
$white = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
$red = imagecolorallocate($img, 255, 0, 0);
$pink = imagecolorallocate($img, 200, 0, 150);

function randomString($length)
{
  $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
  srand((double)microtime()*1000000);
  $str = "";
  $i = 0;
     while($i <= $length)
     {
       $num = rand() % 33;
       $tmp = substr($chars, $num, 1);
       $str = $str. $tmp;
       $i++;
     }
     return $str;
}

for($i=1;$i<rand(1,5);$i++)
{
  $color = (rand(1,2) == 1) ? $red : $white;
  imageline($img,rand(5,70),rand(5,20),rand(5,70)+5,rand(5,20)+5, $color);
}

imagefill($img, 0, 0, $black);

$string = randomString(rand(3,4));
$_SESSION['string'] = $string;

imagettftext($img, 12, 1, 10, 20, $white, "Stencil.ttf", randomString(rand(3,4)));

imagepng($img);
imagedestroy($img);
?>

<?php
header("Content-Type: image/png");
$img = imagecreatetruecolor(75,30);
$white = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
$red = imagecolorallocate($img, 255, 0, 0);
$pink = imagecolorallocate($img, 200, 0, 150);
 
function randomString($length)
{
  $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
  srand((double)microtime()*1000000);
  $str = "";
  $i = 0;
     while($i <= $length)
     {
       $num = rand() % 33;
       $tmp = substr($chars, $num, 1);
       $str = $str. $tmp;
       $i++;
     }
     return $str;
}
 
for($i=1;$i<rand(1,5);$i++)
{
  $color = (rand(1,2) == 1) ? $red : $white;
  imageline($img,rand(5,70),rand(5,20),rand(5,70)+5,rand(5,20)+5, $color);
}
 
imagefill($img, 0, 0, $black);
 
$string = randomString(rand(3,4));
$_SESSION['string'] = $string;
 
imagettftext($img, 12, 1, 10, 20, $white, "Stencil.ttf", randomString(rand(3,4)));
 
imagepng($img);
imagedestroy($img);
?>

<?php include('captcha.php');?>

<?php include('captcha.php');?>