图片验证码类

我会带着你远行 2022-04-04 03:26 389阅读 0赞

<?php
    
    class base_vcode_gd
    {
        //图片资源
        private $image=null;
        //生成的验证码字的个数
        public $codeNum;
        //验证码高度
        public $height = 35;
        //验证码宽度
        public $width = 100;
        //干扰元素数量
        private $disturbColorNum;
        //生成的code
        public $code='';
        //是否生成中文验证码
    
        public function setPicSize($height=35, $width=100)
        {
            $this->height = $height;
            $this->width = $width;
        }
    
        public function length($length)
        {
            //设置干扰元素数量
            $number=floor($this->width*$this->height/20);
            if($number > 240-$this->codeNum)
            {
                $this->disturbColorNum=	240-$this->codeNum;
            }
            else
            {
                $this->disturbColorNum=$number;
            }
            $this->codeNum = $length;
    
            //生成code
            $this->createCode();
        }
    
        //显示验证码图片
        public function display()
        {
            if( is_file(app::get('base')->res_dir.'/fonts/Menlo.ttc') )
            {
                $fontFace = app::get('base')->res_dir.'/fonts/Menlo.ttc';
            }
    
            //创建图片资源
            $this->createImage();
            //设置干扰颜色
            //$this->setDisturbColor();
    
            //往图片上添加文本
            $this->outputText($fontFace);
    
            $this->distortionText();
    
            //输出图像
            $this->ouputImage();
        }
    
    
        function base64Image()
        {
            if( is_file(app::get('base')->res_dir.'/fonts/Menlo.ttc') )
            {
                $fontFace = app::get('base')->res_dir.'/fonts/Menlo.ttc';
            }
    
            //创建图片资源
            $this->createImage();
            //设置干扰颜色
            //$this->setDisturbColor();
    
            //往图片上添加文本
            $this->outputText($fontFace);
    
            $this->distortionText();
    
            ob_get_clean();
            ob_start();
            if(imagetypes() & IMG_GIF)
            {
                $type = 'gif';
                imagepng($this->image);
            }
            else if(imagetypes() & IMG_JPG)
            {
                $type = 'jpg';
                imagepng($this->image);
            }
            else if(imagetypes() & IMG_PNG)
            {
                $type = 'png';
                imagepng($this->image);
            }
            else
            {
                $type = 'png';
                imagepng($this->image);
            }
            $imageData = ob_get_contents();
            ob_end_clean();
    
            $base64 = 'data:image/' . $type . ';base64,' . base64_encode($imageData);
            return $base64;
        }
    
        public function get_code()
        {
            return strtolower($this->code);
        }
    
        //创建图片 无边框
        private function createImage()
        {
            //生成图片资源
            $this->image=imagecreatetruecolor($this->width,$this->height);
            //画出图片背景
            $this->backColor=imagecolorallocate($this->image,mt_rand(255,255),mt_rand(255,255),mt_rand(255,255));
            imagefill($this->image,0,0,$this->backColor);
        }
    
        //设置干扰颜色
        private function setDisturbColor()
        {
            //画出点干扰
            for($i=0;$i<=$this->disturbColorNum;$i++)
            {
                $pixelColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
                imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pixelColor);
            }
            //画出干扰线
            //$this->__wirteSinLine();
        }
    
        //@扭曲文字
        public function distortionText()
        {
            $this->distortionImage = imagecreatetruecolor($this->width, $this->height);
            imagefill($this->distortionImage, 0, 0, $this->backColor);
            for ($x = 0; $x < $this->width; $x++)
            {
                for ($y = 0; $y < $this->height; $y++)
                {
                    $rgbColor = imagecolorat($this->image, $x, $y);
                    imagesetpixel($this->distortionImage, (int) ($x + sin($y / $this->height * 2 * M_PI - M_PI * 0.5) * 3), $y, $rgbColor);
                }
            }
            $this->image = $this->distortionImage;
        }
    
        //往图片上添加文本
        private function outputText($fontFace='')
        {
            //画出code
            for($i=0;$i<$this->codeNum;$i++)
            {
                $fontColor=imagecolorallocate($this->image,0,0,255);
                //设置了fontFace 则使用imagettftext
                if($fontFace)
                {
                    $fontSize=mt_rand($this->width/$this->codeNum-5,$this->width/$this->codeNum-4);
                    $x=floor(($this->width-3)/$this->codeNum)*$i+5;
                    $y=mt_rand($fontSize, $this->height-5);
                    imagettftext($this->image,$fontSize,mt_rand(-30, 30),$x,$y ,$fontColor, $fontFace,self::msubstr($this->code,$i));
                }
                else
                {
                    //没有设置 fontFace 则使用 imagechar
                    $fontSize=mt_rand(4,6);
                    $x=floor($this->width/$this->codeNum)*$i+3;
                    $y=mt_rand(0,$this->height-20);
                    imagechar($this->image,$fontSize,$x,$y,$this->code{$i},$fontColor);
                }
            }
        }
    
        //生成code
        private function createCode()
        {
            if( base_mobiledetect::isMobile() && $_COOKIE['browse'] != 'pc')
            {
                $string = '0123456789';
            }
            else
            {
                $string='0123456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
            }
    
            $code='';
            for($i=0;$i<$this->codeNum;$i++)
            {
                $char=self::msubstr($string,mt_rand(0,mb_strlen($string,'utf-8')-1));
                $this->code.=$char;
            }
        }
    
        //输出图像
        private function ouputImage()
        {
            ob_get_clean();
            if(imagetypes() & IMG_GIF)
            {
                header("Content-Type:image/gif");
                imagepng($this->image);
            }
            else if(imagetypes() & IMG_JPG)
            {
                header("Content-Type:image/jpeg");
                imagepng($this->image);
            }
            else if(imagetypes() & IMG_PNG)
            {
                header("Content-Type:image/png");
                imagepng($this->image);
            }
            else
            {
                header("Content-Type:image/vnd.wap.wbmp");
                imagepng($this->image);
            }
            //exit;
        }
    
        //画正弦干扰线
        private function __wirteSinLine($w=100)
        {
            $color = imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    
            $img=$this->image;
    
            $h=$this->height;
            $h1=rand(-5,5);
            $h2=rand(-1,1);
            $w2=rand(10,15);
            $h3=rand(4,6);
            $funArr = array('sin','cos');
            $funKey = rand(0,1);
            $fun = $funArr[$funKey];
            for($i=-$w/2;$i<$w/2;$i=$i+0.1)
            {
                $y=$h/$h3*$fun($i/$w2)+$h/2+$h1;
                imagesetpixel($img,$i+$w/2,$y,$color);
                $h2!=0?imagesetpixel($img,$i+$w/2,$y+$h2,$color):null;
            }
        }
    
        /*
         * msubstr() 截取字符串
         *
         */
        static private function msubstr($str, $start=0, $length=1, $charset="utf-8")
        {
            if(function_exists("mb_substr"))
            {
                $slice = mb_substr($str, $start, $length, $charset);
            }
            elseif(function_exists('iconv_substr'))
            {
                $slice = iconv_substr($str,$start,$length,$charset);
            }
            else
            {
                $re['utf-8']   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
                $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
                $re['gbk']    = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
                $re['big5']   = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
                preg_match_all($re[$charset], $str, $match);
                $slice = join("",array_slice($match[0], $start, $length));
            }
            return $slice;
        }
    
        // 摧毁资源
        public function __destruct()
        {
            imagedestroy($this->image);
        }
    }