鼠…鼠标放错地方了!

随笔- 39  文章- 0  评论- 1  阅读- 17万 
复制代码
class Captcha
{
    private $width;
    private $height;
    private $codeNum;
    private $code;
    private $im;

    function __construct($width=80, $height=30, $codeNum=4){
        $this->width = $width;
        $this->height = $height;
        $this->codeNum = $codeNum;
    }

    function showImg(){
        //创建图片
        $this->createImg();
        //设置干扰元素
        $this->setDisturb();
        //设置验证码
        $this->setCaptcha();
        //输出图片
        $this->outputImg();
    }

    function getCaptcha(){ 
        $this->createCode();
        return $this->code;
    }

    private function createImg(){
        $this->im = imagecreatetruecolor($this->width, $this->height);
        $bgColor = imagecolorallocate($this->im, 100, 100, 100);//X,124,124,124
        imagefill($this->im, 0, 0, $bgColor);
    }

    private function setDisturb(){
        $area = ($this->width * $this->height) / 20;
        $disturbNum = ($area > 250) ? 250 : $area;
        //加入点干扰
        for ($i = 0; $i < $disturbNum; $i++) {
            $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
            imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
        }
        //加入弧线
//        for ($i = 0; $i <= 5; $i++) {
//            $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
//            imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
//        }
    }

    private function createCode(){
        $str = "0123456789";

        for ($i = 0; $i < $this->codeNum; $i++) {
            $this->code .= $str{rand(0, strlen($str) - 1)};
        }
    }

    private function setCaptcha(){
        for ($i = 0; $i < $this->codeNum; $i++) {
            $color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));
            $size = rand(floor($this->height / 5), floor($this->height / 3));
            $x = floor($this->width / $this->codeNum) * $i + 5;
            $y = rand(0, $this->height - 20);
            imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
        }
    }

    private function outputImg(){
        ob_clean();
        if (imagetypes() & IMG_JPG) {
            header('Content-type:image/jpeg');
            imagejpeg($this->im);
        } elseif (imagetypes() & IMG_GIF) {
            header('Content-type: image/gif');
            imagegif($this->im);
        } elseif (imagetype() & IMG_PNG) {
            header('Content-type: image/png');
            imagepng($this->im);
        } else {
            die("Don't support image type!");
        }
    }
复制代码

效果如图:

 posted on   xiao韩de博客  阅读(223)  评论(0编辑  收藏  举报
编辑推荐:
· DeepSeek 解答了困扰我五年的技术问题
· 为什么说在企业级应用开发中,后端往往是效率杀手?
· 用 C# 插值字符串处理器写一个 sscanf
· Java 中堆内存和栈内存上的数据分布和特点
· 开发中对象命名的一点思考
阅读排行:
· DeepSeek 解答了困扰我五年的技术问题。时代确实变了!
· PPT革命!DeepSeek+Kimi=N小时工作5分钟完成?
· What?废柴, 还在本地部署DeepSeek吗?Are you kidding?
· DeepSeek企业级部署实战指南:从服务器选型到Dify私有化落地
· 程序员转型AI:行业分析
点击右上角即可分享
微信分享提示