public static function show()
{
$width = self::$width;
$height = self::$height;
$len = self::$len;
$bgcolor = self::$bgcolor;
$noise = self::$noise;
$noisenum = self::$noisenum;
$border = self::$border;
$bordercolor = self::$bordercolor;
self::$_image = imageCreate($width, $height);
$back = self::getcolor($bgcolor);
imageFilledRectangle(self::$_image, 0, 0, $width, $height, $back);
$size = $width / $len;
if ($size > $height) {
$size = $height;
}
$left = ($width - $len * ($size + $size / 10)) / $size;
for ($i = 0; $i < $len; $i++) {
$randtext = self::vchar();
self::$_code .= $randtext;
$textColor = imageColorAllocate(self::$_image, rand(0, 100), rand(0, 100), rand(0, 100));
$font = dirname(__FILE__) . "/3.ttf";
$randsize = rand($size - $size / 5, $size - $size / 10);
$location = $left + ($i * $size + $size / 10);
imagettftext(self::$_image, $randsize, rand(-18, 18), $location, rand($size - $size / 100, $size + $size / 100), $textColor, $font, $randtext);
}
if ($noise == true) {
self::setnoise();
}
self::setCode(self::$_code);
//setrawcookie("code",$code,time()+3600,"/");
//setcookie("code", $code, time()+120);
$bordercolor = self::getcolor($bordercolor);
if ($border == true) {
imageRectangle(self::$_image, 0, 0, $width - 1, $height - 1, $bordercolor);
}
return self::$_image;
}
//单个验证码字符高度随机，避免被OCR
}
} else {
//如果设置了背景色和前景色，则不使用随机颜色
imagecolorallocate($this->im, $this->bgColor[0], $this->bgColor[1], $this->bgColor[2]);
$randString = $this->randString();
$fontColor = imagecolorallocate($this->im, $this->fontColor[0], $this->fontColor[1], $this->fontColor[2]);
for ($i = 0; $i < $this->length; $i++) {
imagestring($this->im, 3, $i * 10 + 8, mt_rand(0, 4), $randString[$i], $fontColor);
//每个验证码字符高度仍然随机
}
}
// $this->drawDot();//绘制噪点
// $this->drawLine();//绘制干扰线
imagepng($this->im);
imagedestroy($this->im);
$randString = strtolower($randString);
return md5($randString);
//返回MD5加密后的验证码，可直接放入session
}
}
session_start();
$vcode = new Vcode();
$vcode->setBgColor('#cccccc');
$vcode->setFontColor('#ffffff');
$vcode->setLength(4);
$_SESSION['vcode'] = $vcode->paint();
// To be encrypted by MD5
?>
<?php include 'vcode.class.php'; $vcode = new Vcode(80, 30, 4); $_SESSION['code'] = $vcode->getcode(); $vcode->outimg();
{
if (imagetypes() & IMG_GIF) {
header("Content-type: image/gif");
imagegif($this->img);
} elseif (function_exists("imagejpeg")) {
header("Content-type: image/jpeg");
imagegif($this->img);
} elseif (imagetypes() & IMG_PNG) {
header("Content-type: image/png");
imagegif($this->img);
} else {
die("No image support in this PHP server");
}
}
private function createcode()
{
$codes = "ABCDEFGHIGKLMNOPQRSTUVWXYZ";
$code = "";
for ($i = 0; $i < $this->num; $i++) {
$code .= $codes[rand(0, strlen($codes) - 1)];
}
return $code;
}
function __destruct()
{
imagedestroy($this->img);
}
}
$vcode = new Vcode(80, 30, 4);
setcookie("captcha", str_rot13($vcode->getcode()), time() + 60 * 2);
$vcode->outimg();
function getVcode()
{
require_once _LIBS . "Vcode/Vcode.class.php";
$image = Vcode::show();
header("Content-type: image/png");
$image = imagePng($image);
imagedestroy($image);
exit;
}
/**
* 验证码图片流
* @param void
* @return image obj
*/
function codeAction()
{
$code = new Vcode();
//实例化一个对象
$code->doimg();
}
<?php
header("content-type:image/png");
session_start();
/*************************
*
*在这里要实现的功能：
*1.实例化验证码类，获得验证码对象；
*2.从这个对象获取这个验证码的字符值，把这个值存入SESSION，然后在login.php这个脚本里面
比对POST过来的用户输入的验证码字符值与SESSION里面的字符值是否相同，达到验证的目的；
*3.从这个对象里面获得验证码图像，从这里echo出去
*
**************************/
//推荐4位长度，50*20尺寸
$vCode = new Vcode(60, 20, 4, 1);
$vCodeString = $vCode->achieveString();
$_SESSION['vcode'] = $vCodeString;
$vCode->achieveImage();
$vCode = NULL;
class Vcode
{
private $width;
private $height;
//验证码位数
private $bitNum;
//复杂度，1：全数字，2：数字字母组合
private $complexity;
//验证码字符值
private $vCodeString;
function __construct($width, $height, $bitNum, $complexity)
{
