<?
header('Content-type: image/png'); 
putenv('GDFONTPATH='.realpath('.'));

if(file_exists('captcha.txt')) unlink('captcha.txt');
$captcha = array(
  'symbols' => '0123456789', 
  'lenght' => 5, 
  'width' => 100, 
  'height' => 32, 
  'font' => 'captcha', 
  'fontSize' => 19, 
  'text' => ''
);

$captcha['image'] = imagecreatetruecolor($captcha['width'], $captcha['height']);
$captcha['background'] = imagecolorallocatealpha($captcha['image'], 0, 0, 0, 127);
imagefill($captcha['image'], 0, 0, $captcha['background']);
imagesavealpha($captcha['image'], true);

for ($i = 0; $i < $captcha['lenght']; $i++){
  $captcha['text'] .= $captcha['symbols'][rand(0, strlen($captcha['symbols']) - 1)];
  $captcha['color'] = rand(100, 180);
  $captcha['textColor'] = imagecolorallocate($captcha['image'], $captcha['color'], $captcha['color'], $captcha['color']);
  imagettftext($captcha['image'], $captcha['fontSize'], 0, ($i * 20), 27, $captcha['textColor'], $captcha['font'], $captcha['text'][$i]);
}

$fp = fopen('captcha.txt', 'w'); 
$test = fwrite($fp, md5($captcha['text']));
fclose($fp);

imagepng($captcha['image']);
imagedestroy($captcha['image']);
?>