PHP写一个生成验证码的类

最新推荐文章于 2021-04-14 07:21:16 发布

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最新推荐文章于 2021-04-14 07:21:16 发布

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分类专栏： php 文章标签： php 验证码

本文链接：https://blog.youkuaiyun.com/weixin_36797624/article/details/58300650

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本文介绍了一个自定义的验证码生成类，包括生成验证码图片、内容、干扰元素等，并实现了验证码的session存储与验证流程。

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看了网上的例子，根据自己的想法写了一个生成验证码的类。

createverify.class.php

<?php
    /**
     * 验证码类
     * @author hui
     * $width->验证码宽度
     * $height->验证码高度
     * $str->字符因子
     * $font->字体名字及路径
     */
    class Createverify{
        private $img;
        private $img_width;
        private $img_height;
        private $img_bgc;
        private $str;
        private $code_content;
        private $code_color;
        private $code_font;

        public function __construct($width,$height,$str,$font){
            $this->img_width=$width;
            $this->img_height=$height;
            $this->str=$str;
            $this->code_font=$font;
            $this->Get_code();
            $this->Session_code();
        }
        //生成验证码图片
        public function Get_img(){
            $this->img=imagecreate($this->img_width,$this->img_height);
            $this->img_bgc=imagecolorallocate($this->img,255,255,255);
            $this->Get_pixle();
            $this->Get_line();
            $x=5;
            foreach ($this->code_content as $key) {
                $this->code_color = imagecolorallocate($this->img, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));
                imagettftext($this->img,mt_rand(16,24), mt_rand(-15,15),$x,mt_rand(22,32), $this->code_color,$this->code_font,$key);
                $x+=24;
            }
            header('Content-type:image/png');
            imagepng($this->img);
            imagedestroy($this->img);
        }
        //生成验证码内容
        private function Get_code(){
            $this->str=str_shuffle($this->str);
            for($i=0;$i<4;$i++){
                $this->code_content[$i]=substr($this->str,mt_rand($i,strlen($this->str)-1),1);
            }
        }
        //生成干扰点
        private function Get_pixle(){
            for($i=0;$i<25;$i++){
                imagesetpixel($this->img,mt_rand(0,$this->img_width),mt_rand(0,$this->img_height),imagecolorallocate($this->img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)));
            }
        }
        //生成干扰线
        private function Get_line(){
            for($i=0;$i<4;$i++){
                imageline($this->img,mt_rand(0,$this->img_width-1),mt_rand(0,$this->img_height-1),mt_rand(0,$this->img_width-1),mt_rand(0,$this->img_height-1),imagecolorallocate($this->img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)));
            }
        }
        //session存储验证码
        public function Session_code(){
            session_start();
            $_SESSION['code']=implode("",$this->code_content);
        }
    }
?>

verify.html

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>登录/注册的验证码</title>
    </head>
    <body>
        <form action="check_verify.php" method="post">
            <input type="text" name="code" /><br/>
            <img src="show_verify.php" onclick="this.setAttribute('src','show_verify.php?'+Math.random())" />
            <span>点击图片刷新验证码</span><br/>
            <input type="submit" name="sub" value="登录/注册" />
        </form>
    </body>
</html>

show_verify.php

<?php
    require './createverify.class.php';
    $str='0123456789';
    $font="./MONACO.TTF";
    $code = new Createverify(100,40,$str,$font);
    $code->Get_img();
?>

check_verify.php

<?php
    header('Content-type:text/html;charset="utf-8"');
    session_start();
    if($_POST['code']!=''){
        if($_SESSION['code']==$_POST['code']){
            echo '<script type="text/javascript">
                    alert("验证码正确");
                    window.location.href="verify.html";
                </script>';
        }else{
            echo '<script type="text/javascript">
                    alert("验证码错误");
                    window.location.href="verify.html";
                </script>';
        }
    }
?>

链接: https://pan.baidu.com/s/1dEXvcIX 密码: em38