what is the problem with this? captcha?

[solidcodes]

hi guys

i'm trying to analyze an existing codes created by another programmer,

<?php
session_start();

$RandomStr = md5(microtime());// md5 to generate the random string

$ResultStr = substr($RandomStr,0,5);//trim 5 digit 

$NewImage = imagecreatefromjpeg("images/bggreys.jpg");//image create by existing image and as back ground 
            
//$LineColor = imagecolorallocate($NewImage,233,239,239);//line color 
$TextColor = imagecolorallocate($NewImage, 255, 255, 255);//text color-white

//imageline($NewImage,1,1,40,40,$LineColor);//create line 1 on image 
//imageline($NewImage,1,100,60,0,$LineColor);//create line 2 on image 

imagestring($NewImage, 7, 30, 3, $ResultStr, $TextColor);// Draw a random string horizontally 

$_SESSION['key'] = $ResultStr;// carry the data through session

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

imagejpeg($NewImage);//Output image to browser 

?>

It's trying to create a captcha.

But unfurtunately it's not working...

Any help to fix this codes running properly please.

Thank you in advance.

[guido2004]

When you post php code, please use the php code tags. It makes for an easier read

But unfurtunately it's not working...

What does that mean?

[solidcodes]

By the way i noticed some of the built in php functions don't work in the site.

example of function is imagecreate() this is built in php but i don't work, see below,
http://onstaged.com/ztest/captcha3.php

why is this?

thanks in advance.

[AnthonySterling]

Your PHP installation does not have the GD library installed.