<?php
session_start();
 
$number = rand(1,999); 
$_SESSION['number'] = $number; 
 
$img_number = imagecreate(40,25);
$backcolor = imagecolorallocate($img_number,98,109,117);
$textcolor = imagecolorallocate($img_number,174,231,88);
 
imagefill($img_number,0,0,$backcolor);
 
imagestring($img_number,10,5,5,$number,$textcolor);
 
header("Content-type: image/jpeg");
imagejpeg($img_number);
?>