I made a php file, called createCaptcha.php, and the code is this :
create_image();
exit();
function create_image() {
//Let's generate a totally random string using md5
$md5_hash = md5(rand(0,999));
//We don't need a 32 character long string so we trim it down to 5
$security_code = substr($md5_hash, 15, 5);
//Set the session to store the security code
$_SESSION["security_code"] = $security_code;
//Set the image width and height
$width = 100;
$height = 20;
//Create the image resource
$image = ImageCreate($width, $height);
//We are making three colors, white, black and gray
$white = ImageColorAllocate($image, 255, 255, 255);
$black = ImageColorAllocate($image, 0, 0, 0);
$grey = ImageColorAllocate($image, 204, 204, 204);
//Make the background black
ImageFill($image, 0, 0, $black);
//Add randomly generated string in white to the image
ImageString($image, 3, 30, 3, $security_code, $white);
//Throw in some lines to make it a little bit harder for any bots to break
ImageRectangle($image,0,0,$width-1,$height-1,$grey);
imageline($image, 0, $height/2, $width, $height/2, $grey);
imageline($image, $width/2, 0, $width/2, $height, $grey);
//Tell the browser what kind of file is come in
header("Content-Type: image/jpeg");
//Output the newly created image in jpeg format
ImageJpeg($image);
//Free up resources
ImageDestroy($image);
}
Now, when I try to do an include('createCaptcha.php'); I get this warning :
Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\gtw\index.php:14) in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\gtw\registration\createCaptcha.php on line 43
And the output is a series of incomprensible bits (I think the ones which rapresent the image). In fact I setup the header before. How can I fix this problem?
<head>...