Creating a PHP captcha system
This is a very useful, yet simple PHP script which keeps the spambots away from your information.
Firstly, create a file called captcha.php, and insert this code:
< ?php header("Content-type: image/png"); $string = "abcdefghijklmnopqrstuvwxyz0123456789"; for($i=0;$i<6;$i++){ $pos = rand(0,36); $str .= $string{$pos}; } $img_handle = ImageCreate (60, 20) or die ("Cannot Create image"); //Image size (x,y) $back_color = ImageColorAllocate($img_handle, 255, 255, 255); //Background color RBG $txt_color = ImageColorAllocate($img_handle, 0, 0, 0); //Text Color RBG ImageString($img_handle, 31, 5, 0, $str, $txt_color); Imagepng($img_handle); session_start(); $_SESSION['img_number'] = $str; ?>