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<?php
class captcha
{
protected $width = 160;
protected $height = 45;
private $pool = '23456789abdefghijnqrtuyABDEFGHJLNQRTY';
private $fonts = array();
public function __construct($width = null, $height = null)
{
if (!empty($width)) {
$this->width = $width;
}
if (!empty($height)) {
$this->height = $height;
}
}
public function create_captcha()
{
$image = @imagecreatetruecolor($this->width, $this->height) or die("Cannot Initialize new GD image stream");
// set background to white and allocate drawing colours
$background = imagecolorallocate($image, 0x00, 0x00, 0x8B);
imagefill($image, 0, 0, $background);
$linecolor = imagecolorallocate($image, 0x1F, 0x3F, 0x70);
$textcolors = array(
$textcolor = imagecolorallocate($image, 0xB4, 0x95, 0x3C),
$textcolor = imagecolorallocate($image, 0xE8, 0x21, 0x25),
);
for ($i = 0; $i < 6; $i++) {
imagesetthickness($image, rand(1, 3));
imageline($image, 0, rand(0, $this->height), $this->width, rand(0, $this->height), $linecolor);
}
$fonts = array(
dirname(__FILE__) . DIRECTORY_SEPARATOR . "fonts" . DIRECTORY_SEPARATOR . 'dejavu/1.ttf',
dirname(__FILE__) . DIRECTORY_SEPARATOR . "fonts" . DIRECTORY_SEPARATOR . 'dejavu/2.ttf',
dirname(__FILE__) . DIRECTORY_SEPARATOR . "fonts" . DIRECTORY_SEPARATOR . 'dejavu/3.ttf',
dirname(__FILE__) . DIRECTORY_SEPARATOR . "fonts" . DIRECTORY_SEPARATOR . 'dejavu/4.ttf',
dirname(__FILE__) . DIRECTORY_SEPARATOR . "fonts" . DIRECTORY_SEPARATOR . 'dejavu/5.ttf',
);
$captcha = '';
for ($x = round($this->width / 16); $x <= round($this->width * 13 / 16); $x += round($this->width / 5.5)) {
$captcha .= ($char = $this->pool[rand(0, strlen($this->pool) - 1 )]);
imagettftext($image, rand(round($this->width / 8.2), round($this->width / 7.6)), rand(-30, 30), $x, rand(round($this->height / 2.25), round($this->height / 1.1)), $textcolors[array_rand($textcolors)], $fonts[array_rand($fonts)], $char);
}
if (!session_id()) {
session_start();
}
$_SESSION['captcha'] = $captcha;
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
}
}
$captcha = new captcha();
$captcha->create_captcha();
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