font = public_path() . '/fonts/Elephant.ttf';//注意字体路径要写对，否则显示不了图片        $this->createCode();    }    //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()    {        $this->img = imagecreatetruecolor($this->width, $this->height);        $color = imagecolorallocate($this->img, mt_rand(157, 255), mt_rand(157, 255), mt_rand(157, 255));        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));            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 doimg()    {        $this->createBg();        $this->createLine();        $this->createFont();        $this->outPut();    }    //获取验证码    public function getCode()    {        return strtolower($this->code);    }}