Sekarang saya akan menerangkan cara membuat captcha image atau yang sering kita temukan ketika kita ingin melakukan registrasi suatu forum, email dan lainnya,, disini saya akan mengintegrasikan captcha images dengan sebuah form pendaftaran

Pertama kita buat databasenya terlebih dahulu, bisa dilihat dibawah ini coding programnya

CREATE TABLE user (
id int(100) NOT NULL auto_increment,
nama varchar(32) NOT NULL,
email varchar(64) NOT NULL,
PRIMARY KEY (`id`)
)

include "koneksi.php"; // File Koneksi dari PHP ke MySQL
echo "




Nama :



Email Anda :



Masukan Validasi Anti Spam Dibawah Ini


 

 





";

include "koneksi.php";
$nama = $_POST['nama'];
$email = $_POST['email'];
$security_code = $_POST['security_code'];

$polaemail = "^.+@.+\..+$";
if((!$nama) || (!eregi($polaemail, $email)) || (!$security_code))
{
echo 'Anda belum bisa melakukan kerjasama, Data harus diisi! 

';
if(!$nama){
echo "Kami memerlukan Nama depan anda, Silahkan isi.

";
}
if(!eregi($polaemail, $email)){
echo "Kami memerlukan e-mail anda, Silahkan isi.
";
echo "Ex. contact@citrasolusi.com

";
}
if(!$security_code) {
echo 'Maaf, anda memasukkan security code yang salah

';
}
echo "";
exit;
}

$sql = mysql_query("INSERT INTO user(nama,email)VALUES('$nama','$email')") or die ("Insert Error");
if(!$sql){
print("Terjadi Error system dalam pengiriman data silahkan kirim data anda ke email Admin.
$admin_email");
} else {
include ("index.php");
}

session_start();
class CaptchaSecurityImages {
var $font = 'cour.ttf';
function generateCode($characters) {
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$code = '';
$i = 0;
while ($i < $characters) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++; }
return $code; }
function CaptchaSecurityImages($width='160',$height='40',$characters='6') {
$code = $this->generateCode($characters);
$font_size = $height * 0.70;
$image = @imagecreate($width, $height) or die('Cannot Initialize new GD image stream');
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 20, 40, 100);
$noise_color = imagecolorallocate($image, 1, 200, 200);
for( $i=0; $i<($width*$height)/3; $i++ ) {
imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color); }
for( $i=0; $i<($width*$height)/150; $i++ ) {
imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width),
mt_rand(0,$height), $noise_color); }
$textbox = imagettfbbox($font_size, 0, $this->font, $code);
$x = ($width - $textbox[4])/2;
$y = ($height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code);
imagejpeg($image);
imagedestroy($image);
$_SESSION['security_code'] = $code; }}
$width = isset($_GET['width']) ? $_GET['width'] : '160';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) ? $_GET['characters'] : '6';
header('Content-Type: image/jpeg');
$captcha = new captchasecurityimages($width,$height,$characters);

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