PHP 之验证码类封装

迈不过友情╰ 2023-08-17 17:27 134阅读 0赞

一、效果图

![1509251-20190813130514336-2139517937.png][]

二、类代码

<?php
    /**
     * Created by PhpStorm.
     * User: Yang
     * Date: 2019/8/13
     * Time: 10:51
     */
    
    class Captcha
    {
        private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子
        private $code;//验证码
        private $codelen = 4;//验证码长度
        private $width = 130;//宽度
        private $height = 50;//高度
        private $img;//图形资源句柄
        private $font;//指定的字体
        private $fontsize = 20;//指定字体大小
        private $fontcolor;//指定字体颜色
    
        //构造方法初始化
        public function __construct()
        {
         
            $this->font = dirname(__FILE__) . '/font/Elephant.ttf';//注意字体路径要写对，否则显示不了图片
        }
    
        //生成随机码
        private function createCode()
        {
            $_len = strlen($this->charset) - 1;
            for ($i = 0; $i < $this->codelen; $i++) {
                $this->code .= $this->charset[mt_rand(0, $_len)];
            }
        }
    
        //生成背景
        private function createBg()
        {
            //创建真彩图像资源
            $this->img = imagecreatetruecolor($this->width, $this->height);
            //分配一个随机色
            $color = imagecolorallocate($this->img, mt_rand(157, 255), mt_rand(157, 255), mt_rand(157, 255));
            //画一矩形并填充随机色
            imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
        }
    
        //生成文字
        private function createFont()
        {
            $_x = $this->width / $this->codelen;
            for ($i = 0; $i < $this->codelen; $i++) {
                $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
                //可以绘制汉字
                //绘制验证码
                imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
            }
        }
    
        //生成线条、雪花
        private function createLine()
        {
            //线条
            for ($i = 0; $i < 6; $i++) {
                $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
                imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
            }
            //雪花
            for ($i = 0; $i < 100; $i++) {
                $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
                imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color);
            }
        }
    
        //输出
        private function outPut()
        {
            header('Content-type:image/png');
            imagepng($this->img);
            imagedestroy($this->img);
        }
    
        //对外生成
        public function createImage()
        {
            $this->createBg();
            $this->createCode();
            $this->createLine();
            $this->createFont();
            $this->outPut();
        }
    
        //获取验证码
        public function getCode()
        {
            return strtolower($this->code);
        }
    }

三、使用

<?php
    /**
     * Created by PhpStorm.
     * User: Yang
     * Date: 2019/8/13
     * Time: 11:02
     */
    
    include "./Captcha.php";
    
    $c = new Captcha();
    $c->createImage();

四、源代码

链接：[https://pan.baidu.com/s/1i2MNN-y0xl4Qsfhn0EhGJQ ][https_pan.baidu.com_s_1i2MNN-y0xl4Qsfhn0EhGJQ]  
提取码：qtfx

转载于:https://www.cnblogs.com/yang-2018/p/11345283.html

[1509251-20190813130514336-2139517937.png]: /images/20230808/edb252c85f7f4eb69b68e81538f07d2e.png
[https_pan.baidu.com_s_1i2MNN-y0xl4Qsfhn0EhGJQ]: https://pan.baidu.com/s/1i2MNN-y0xl4Qsfhn0EhGJQ%20