captcha.php

<?php
    session_start();
    header("Content-Type: image/png");
    $_SESSION["Captcha"]="";
    $im = @imagecreate(110, 50) or die("Cannot Initialize new GD image stream");
    $background_color = imagecolorallocate($im, 48, 128, 117);
    $text_color = imagecolorallocate($im, 176, 201, 197);
    $angka=rand(1000000, 9999999);
    $_SESSION["Captcha"].=$angka;
    imagestring($im, 20, 25, 10,  $angka, $text_color);
    imagepng($im);
    imagedestroy($im);
?>