private function drawLines($image, $amount)
{
$amount = $amount ? $amount : 1;
while ($amount) {
imagesetthickness($image, rand(1, 2));
$line_color = imagecolorallocate($image, rand(0, 152), rand(0, 152), rand(0, 152));
imageline($image, rx(), ry(), rx(), ry(), $line_color);
$amount--;
}
}
return rand(0, 100);
}
function ry()
{
return rand(0, 30);
}
//Generate captcha and set in session.
$start = rand(0, 25);
$captcha = strtoupper(substr(md5(microtime()), $start, $length));
$_SESSION['capkey'] = $captcha;
//Create image.
$image = @imagecreatetruecolor(100, 30) or die("Cannot Initialize new GD image stream");
while ($lines) {
imagesetthickness($image, rand(1, 2));
$line_color = imagecolorallocate($image, rand(153, 255), rand(153, 255), rand(153, 255));
imageline($image, rx(), ry(), rx(), ry(), $line_color);
$lines--;
}
//Write out each letter individually.
$index = 0;
$x = $padding;
while ($index < strlen($captcha)) {
$text_color = imagecolorallocate($image, rand(153, 255), rand(153, 255), rand(153, 255));
//Calculate position.
$f = rand(3, 5);
$x = $x + imagefontwidth($f) + rand(2, 6);
$y = rand(4, 30 - imagefontheight($f) - 4);
imagestring($image, $f, $x + 1, $y + 1, substr($captcha, $index, 1), $text_color);
imagestring($image, $f, $x, $y, substr($captcha, $index, 1), $text_color);
$index++;
}
