<?php 
// save this code in your random script

error_reporting(-1);
ini_set('error_reporting', E_ALL);

session_start();

    $length = 0;
    for ($i = 0; $i < 6; $i++) {
        // this numbers refer to numbers of the ascii table (small-caps)
        $str .= chr(rand(97, 122));
    }
    $_SESSION['captcha'] = $str;

$imgX = 180;
$imgY = 60;
$image = imagecreatetruecolor(180, 60);

$backgr_col = imagecolorallocate($image, 238,239,239);
$border_col = imagecolorallocate($image, 208,208,208);
$text_col = imagecolorallocate($image, 60,60,60);
$noise_color = imagecolorallocate($image, 80, 80, 80);

imagefilledrectangle($image, 0, 0, 180, 60, $backgr_col);
imagerectangle($image, 0, 0, 179, 59, $border_col);

for( $i=0; $i<($imgX*$imgY)/3; $i++ ) {
         imagefilledellipse($image, mt_rand(0,$imgX), mt_rand(0,$imgY), 1, 1, $noise_color);
}

$font = "./actionj.ttf"; // it's a Bitstream font check www.gnome.org for more
$font_size = 30;
$angle = 0;

phpinfo();

echo "<pre>". print_r(gd_info(), true) ."</pre>";
echo "1<Br>";

$box = imagettfbbox($font_size, $angle, $font, $_SESSION['captcha']);

echo "1.5<br>";

$x = (int)($imgX - $box[4]) / 2;
$y = (int)($imgY - $box[5]) / 2;
imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $_SESSION['captcha']);

echo "2<br>";

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