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<?php /* 
example of usage: 

inside your form 
<input type="text" name="validator" id="validator" size="4" /> 
<img src="random.php" alt="CAPTCHA image" width="60" height="20" vspace="1" align="top" /> 

and test the value of the "validator" form field like: 
if (!empty($_POST['validator']) && $_POST['validator'] == $_SESSION['rand_code']) { 
    process your form here 
    at least destroy the session 
    unset($_SESSION['rand_code']); 
*/ 

// save this code in your random script 
session_start(); 

if (empty($_SESSION['rand_code'])) { 
    $str = ""; 
    $length = 0; 
    for ($i = 0; $i < 4; $i++) { 
        // this numbers refer to numbers of the ascii table (small-caps) 
        $str .= chr(rand(97, 122)); 
    } 
    $_SESSION['rand_code'] = $str; 
} 

$imgX = 60; 
$imgY = 20; 
$image = imagecreatetruecolor(60, 20); 

$backgr_col = imagecolorallocate($image, 238,239,239); 
$border_col = imagecolorallocate($image, 208,208,208); 
$text_col = imagecolorallocate($image, 46,60,31); 

imagefilledrectangle($image, 0, 0, 60, 20, $backgr_col); 
imagerectangle($image, 0, 0, 59, 19, $border_col); 

$font = "VeraSe.ttf"; // it's a Bitstream font check www.gnome.org for more 
$font_size = 10; 
$angle = 0; 
$box = imagettfbbox($font_size, $angle, $font, $_SESSION['rand_code']); 
$x = (int)($imgX - $box[4]) / 2; 
$y = (int)($imgY - $box[5]) / 2; 
imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $_SESSION['rand_code']); 

header("Content-type: image/png"); 
imagepng($image); 
imagedestroy ($image); 
?>