Create an image with a random number when the function is called upon

[HoTDaWg]

hey guys,

im trying to create an image in a function, but the image on its own doesnt even work. I get a feeling it is because i took out the:
[code]
header(Content-Type: image/jpg);//or something like that
[/code]
command. I cant include that command because the script where i call the function to already has header info set up, and when i put that command it only shows the page's url. Here is the code to the function:
[code]
<?php
$text = rand(0,100000);
$pic=ImageCreate(100,40);

$coll=ImageColorAllocate($pic,0,0,0);
$coll2=ImageColorAllocate($pic,255,255,255);

ImageFilledRectangle($pic,0,0,500,30,$coll2);
ImageString($pic,3,5,8,$text,$coll);

ImageGIF($pic);

ImageDestroy($pic);

?>
[/code]
basically I want to a function that creates an image with a random number.
thanks.

HoTDaWg

[fert]

[code]
header("Content-Type: image/gif");
[/code]

[Tandem]

[code]<?php
ob_start();
header('Content-type: image/png');
header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
header('Pragma: no-cache');

$img = array();

//////////
// Image settings...
//////////
# Image width in pixels:
$img['width'] = 65;
# Image height in pixels:
$img['height'] = 30;

# Use TTF?
$img['use_ttf'] = true;
# Link to image true type font (only if above value is true):
$img['ttf_font'] = "verdana";
# TTF pt size?
$img['ttf_size'] = 12;
# Not using TTF? Still need a font size. (1-5)
$img['normal_font_size'] = 4;

# Image handle:
$img['handle'] = imagecreatetruecolor($img['width'],
$img['height']);

//////////
// Colors...
//////////
# Black:
$colors['black'] = imagecolorallocate($img['handle'],
0, 0, 0);
# White:
$colors['white'] = imagecolorallocate($img['handle'],
255, 255,
255);
# Gray:
$colors['gray'] = imagecolorallocate($img['handle'],
(255 / 2), (255 / 2),
(255 / 2));
# Red:
$colors['red'] = imagecolorallocate($img['handle'],
255, 0, 0);
# Transparent:
$colors['transparent'] = imagecolorallocate
($img['handle'], 1, 1, 1);
$colors['transparent'] = imagecolortransparent
($img['handle'], $colors['transparent']);

//////////
// Time to get drawing!
//////////
# Background:
imagefilledrectangle($img['handle'], 0, 0,
$img['width'], $img['width'], $colors['black']);
# Left border:
imageline($img['handle'], 0, 0, 0,
$img['height'], $colors['gray']);
# Top border:
imageline($img['handle'], 0, 0,
$img['width'], 0, $colors['gray']);
# Bottom border:
imageline($img['handle'], 0, $img['height'] - 1,
$img['width'], $img['height'] - 1, $colors['gray']);
# Right border:
imageline($img['handle'], $img['width'] - 1, 0,
$img['width'] - 1, $img['height'] - 1, $colors['gray']);

//////////
// Create the string and draw it.
//////////
$img['random_string'] =
strtoupper(substr(md5(uniqid(rand(),true)),0,6));

if($img['use_ttf'] ==
true && file_exists($img['ttf_font'].".ttf"))
{
$img['random_angle'] = rand(-45/4, 45/4);
imagettftext($img['handle'],$img['ttf_size'],$img['random_angle'],
(($img['width'] / 2) - (imagefontwidth($img['ttf_font'])
* strlen($img['random_string']))) + 2,($img['height'] / 2)
+ 2,$colors['gray'],$img['ttf_font'], $img['random_string']);
imagettftext($img['handle'],$img['ttf_size'],
$img['random_angle'],($img['width'] / 2) -
(imagefontwidth($img['ttf_font'])
* strlen($img['random_string'])),$img['height'] / 2,
$colors['white'],$img['ttf_font'],$img['random_string']);  
} else {
imagestring($img['handle'],$img['normal_font_size'],(
$img['width'] / 2) - $img['normal_font_size']
* strlen($img['random_string']),$img['height'] /
2.5,$img['random_string'],$colors['white']);
}

//////////
// Finish up...
//////////
imagepng($img['handle']);
imagedestroy($img['handle']);
?>[/code]
Just save the code into a new file, and then use:

<img src="filename.php">

Should work.

Note: It produces an alphanumeric string, so you may need to change it to suit your needs.

[HoTDaWg]

thanks tandem! The only thing is, and its my fault for not elaborating on my task, but i need to include that kind of an image in a registration form, let the user type in the code, and then check if that code was correct. i want to keep spam bots out of my pretty basic and insecure script.lol. great script though, where did you learn GD?

HoTDaWg

[Jessica]

That's called CAPTCHA - if you google it, there are tons of premade ones.

[HoTDaWg]

thank you jesirose, i found a great one and i will integrate it myself. thanks all.