php-一个简单验证码类-创新互联

The Captcha Class

创新互联坚持“要么做到，要么别承诺”的工作理念，服务领域包括：成都网站建设、成都网站制作、企业官网、英文网站、手机端网站、网站推广等服务，满足客户于互联网时代的宾川网站设计、移动媒体设计的需求，帮助企业找到有效的互联网解决方案。努力成为您成熟可靠的网络建设合作伙伴！

outputImage();
        }
        
        function check($arr) {
            if (isset($arr) && is_array($arr)) {
                if (isset($arr[$this->sessionvar])) {
                    if ($arr[$this->sessionvar] == $_SESSION[$this->sessionvar]) {
                        return true;
                    }
                }
            }
        }
        
        function randomString($length = 6) {
            $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
            for ($i = 0; $i < $length; $i++) {
                $string .= $chars[mt_rand(0, strlen($chars)-1)];
            }
            return $string;
        }
        
        function outputImage() {
            $this->img = ImageCreate ($this->width, $this->height);
            if ($this->img) {
                header("Content-type: p_w_picpath/png"); 
                
                $bg = ImageColorAllocate($this->img, 255, 255, 255); 
                $txt = ImageColorAllocate($this->img, 0, 0, 0); 
                
                $string = $this->randomString($this->chars);
                
                ImageString($this->img, 31, $this->fontsize, 0, $string, $txt);
                Imagepng($this->img); 
                
                $_SESSION[$this->sessionvar] = $string; 
            }
        }
    }
?>

The class has two main functions, run() and check() – The run function will output an p_w_picpath so make sure the HTML p_w_picpath tag is linked to the file where you use the run() function. Examples below.

Showing the Image

include('captcha.php');
$captcha = new Captcha;
$captcha->run();

If you name that file cp_w_picpath.php you can embed it into forms in the following way:

Checking the code

Wherever your form is submitting to is where you should be checking the code. This can either be in the same file or an external file. The following code will allow you to check the $_POST array and make sure the user has entered the correct code.

include('captcha.php');
$captcha = new Captcha;

if ($captcha->check($_POST)) {
    echo 'Correct Code';
} else {
    echo 'Invalid Code';
}

生成图

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

网站标题：php-一个简单验证码类-创新互联
转载注明：http://bjjierui.cn/article/ddjscs.html