<?php session_start(); $code=rand(1000,9999); $_SESSION["code"]=$code; $im = imagecreatetruecolor(60, 28); $bg = imagecolorallocate($im, 100,160,181); $fg = imagecolorallocate($im, 280, 280, 280); imagefill($im, 0, 0, $bg); imagestring($im, 10, 10, 5, $code, $fg); header("Cache-Control: no-cache, must-revalidate"); header('Content-type: image/png'); imagepng($im); imagedestroy($im); ?>