温馨提示×

温馨提示×

您好,登录后才能下订单哦!

密码登录×
登录注册×
其他方式登录
点击 登录注册 即表示同意《亿速云用户服务条款》

php - 一个简单验证码类

发布时间:2020-05-03 23:50:57 来源:网络 阅读:682 作者:brucetam322 栏目:web开发

The Captcha Class

<?php
    class Captcha {
        var $width = 60;
        var $height = 20;
        var $img = null;
        var $chars = 6;
        var $fontsize = 5;
        var $sessionvar = 'captcha';
        
        function __construct() {
            session_start();
        }
        
        function run() {
            $this->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:

<img src="cp_w_picpath.php" alt="Human Verification" /> <input type="text" name="captcha" id="captcha" />

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

php - 一个简单验证码类

向AI问一下细节

免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。

AI