tp5验证码

tp5验证码
类文件位于extend/other/Captcha.php<br> <br> <br> <br>        //控制器中 获取验证码<br>        public function get_captcha(){    <br>         //使用memcheck 设置session    <br>         Session::init(['prefix'=> 'wll_','type'=> '','auto_start' => true]);<br>         $captcha = new \other\Captcha(86,48,4);<br>         echo $captcha->showImg();        <br>         Session::set('code',$captcha->getCaptcha());<br>         exit;    <br>     }<br> <br> <br> <br> <br> 模块中:  <img class="code-img lazy" src="/static/imghw/default1.png" data-src="__WEBSITE__/public/index.php/seller/login/get_captcha" alt="tp5验证码" ><br> <br> <br> <br> <br> echo Session::get('code','wll_'); 输出验证码<br> <br> <br> 以下是Captcha.php 类<br> <?php <br /> namespace other;<br> class Captcha{<br>     private $width;<br>     private $height;<br>     private $codeNum;<br>     private $code;<br>     private $im;<br>     //初始化<br>     function __construct($width=80, $height=20, $codeNum=4){<br>         $this->width = $width;<br>         $this->height = $height;<br>         $this->codeNum = $codeNum;<br>     }<br>     //显示验证码<br>     function showImg(){<br>         //创建图片<br>         $this->createImg();<br>         //设置干扰元素<br>         $this->setDisturb();<br>         //设置验证码<br>         $this->setCaptcha();<br>         //输出图片<br>         $this->outputImg();<br>     }<br>     <br>     //获取显示的验证码,用来验证验证码是否数据正确<br>     function getCaptcha(){<br>         return $this->code;<br>     }<br>     <br>     //创建图片<br>     private function createImg(){<br>         $this->im = imagecreatetruecolor($this->width, $this->height);<br>         $bgColor = imagecolorallocate($this->im, 255, 255, 255);//创建的前景为白色<br>         imagefill($this->im, 0, 0, $bgColor);<br>     }<br>     <br>     //设置干扰元素<br>     private function setDisturb(){<br>         $area = ($this->width * $this->height) / 20;<br>         $disturbNum = ($area > 250) ? 250 : $area;<br>         //加入点干扰<br>         for ($i = 0; $i              $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));<br>             imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);<br>         }<br>         //加入弧线<br>         for ($i = 0; $i              $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));<br>             imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);<br>         }<br>     }<br>     //设置验证码随机数<br>     private function createCode(){<br>         $str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";<br>         for ($i = 0; $i codeNum; $i++) {<br>             $this->code .= $str{rand(0, strlen($str) - 1)};<br>         }<br>     }<br>     //设置验证码<br>     private function setCaptcha(){<br>           <br>         //设置验证码随机数        <br>         $this->createCode();<br>         <br>         //文字前景<br>         $color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));<br>                <br>         //因为imagechar最大的文字字体为5,字体太小而不用这个方式了<br>         //imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);           <br>                <br>         //因为imagechar最大的文字字体为5,而这里要显示更大的文字,所以用 imagefttext <br>         imagefttext($this->im,30,0,10,35,$color,'static/pc/fonts/monofont.ttf',$this->code);//图象资源,尺寸,角度,x轴,y轴,颜色,字体路径,文本插入图像<br>     }<br>     //输出图片<br>     private function outputImg(){<br>         if (imagetypes() & IMG_JPG) {<br>             header('Content-type:image/jpeg');<br>             imagejpeg($this->im);<br>         } elseif (imagetypes() & IMG_GIF) {<br>             header('Content-type: image/gif');<br>             imagegif($this->im);<br>         } elseif (imagetype() & IMG_PNG) {<br>             header('Content-type: image/png');<br>             imagepng($this->im);<br>         } else {<br>             die("Don't support image type!");<br>         }<br>     }//end<br> }

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