PHP and GD Captcha

[carlbulman]

The following code is what I am trying to use for doing a form captcha style verification and all it is throwing back when I load the page is an image of the website address. Does anyone here know where I am going wrong? I have been at this all day and gotten nowhere. Thanks in advance 

 

 <?php
session_start(); 
$rndval = rand(1000, 9999);
$_SESSION['rndnum'] = md5($rndval);
$img = imagecreate(60, 30);
$bgc = imagecolorallocate ($img, 255, 251, 205); 
$fontcolor = imagecolorallocate ($img, 0, 0, 0); 
imagestring ($img, 5, 5, 8, $rndval, $fontcolor); 
header('Content-type: image/jpeg');
imagejpeg($img);
imagedestroy($img);
?>

[carlbulman]

Solved my own problem by helping another guy on here.

To much coffee 

Was a simple error solved by changing ' for a " in the header:

 

header('Content-type: image/jpeg');

 

it now reads:

 

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

[objnoob]

It should have worked using single quotes as well?!

[coupe-r]

it does