前端使用canvas 生成html页面数据，返回Base64 图片数据 php后台接收并保存

下面直接贴代码

项目框架 thinkphp3.2

pubilc function create_img(){

    //传输 base64图片数据 及 保存的路径
    $res=$this->base64_image_content($_POST['base64'],'data/ts_create');
}

//base64图片转换
function base64_image_content($base64_image_content,$path){
    //匹配出图片的格式
    if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
        $type = $result[2];
        $new_file = $path."/".date('Ymd',time())."/";
        if(!file_exists($new_file)){
            //检查是否有该文件夹，如果没有就创建，并给予最高权限
            mkdir($new_file, 0700);
        }
        $new_file = $new_file.time().".{$type}";
        if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
            return '/'.$new_file;
        }else{
            return 1;
        }
    }else{
        return 2;
    }
}

 官方文档使用file_get_html乱码问题处理
              先使用file_get_contents获取页面内容然后转换编码，再使用str_get_html
              mb_convert_encoding($content,'UTF-8',"auto");

        //保存图片路径
        $path=IA_ROOT."/images/";
        // Fetch the html content
        $url = "要抓取的微信文章网址";
        $content = file_get_contents($url);

        $url_info = explode('/', trim($url, '/'));
        $url_info = array_reverse($url_info);
        $page_name = $url_info[0] . '.html';

        // Fetch the images of the page

        //引入simple_html_dom文件 下载地址，下方提供

        require "simple_html_dom.php";

        $html = str_get_html($content);

        // Fetch the real path of the imgaes and download them
        $images = $html->find('img');
        foreach ($images as $index => $image) {
            $image_url = $image->getAttribute('data-src');
            if ($image_url) {
                $image_file = file_get_contents($image_url);
                $url_info = explode('/', trim($image_url, '/'));
                $url_info = array_reverse($url_info);
                $file_name = $url_info[1] . '.jpg';
                $new_image_url = 'images' . DIRECTORY_SEPARATOR . $file_name;
                file_put_contents($path.$file_name, $image_file);
                //设置src 属性内容
                $html->find('img', $index)->setAttribute('src',"/attachment/wechat_article_image/".$file_name);

            }
        }

        // Ftech the real url of the iframe
        $iframes = $html->find('iframe');
        foreach ($iframes as $index => $iframe) {
            $iframe_url = $iframe->getAttribute('data-src');
            // $iframe_w                            = $iframe->getAttribute('data-w');
            $html->find('iframe', $index)->src = $iframe_url;
            // TODO need to calculate the width and height of the video

        }

        //获取div id为 js_content内容
        $res=$html->find('div[id=js_content]',0);
        echo $res;die;
        $doc=$html;
        //修改后的内容
        echo $doc;die;

 public function export_excel(){

       //查询列表传入即可

        $html = $this->wxapp_house_export_parse_zan($list);
        header("Content-type:text/csv");
        header("Content-Disposition:attachment; filename=点赞信息.csv");
        echo $html;
        exit();

    }

    //改善后
        function export_jslog($list) {
            if (empty($list)) {
                return false;
            }
            $header = array(
                'id'=>'id',
                'openid' => 'openid',
                'nickname' => '用户名称',
                'mobile'=>'手机号',
                'province'=>'省',
                'city'=>'市',
                'area'=>'区',
                'mj'=>'面积',
                'shi'=>'室',
                'ting'=>'厅',
                'chu'=>'厨',
                'wei'=>'卫',
                'addtime'=>'计算时间'
            );
            $keys = array_keys($header);
            $html = "\xEF\xBB\xBF";
            foreach ($header as $li) {
                $html .= $li . "\t ,";
            }
            $html .= "\n";

            foreach ($list as $row) {

                $fans=$this->get_fansinfo($row['openid']);
                $row['nickname']=$fans['nickname'];
                $row['addtime']=date('Y-m-d H:i:s',$row['addtime']);
                foreach ($keys as $key) {
                    $data[] = $row[$key];
                }
                $user[] = implode("\t ,", $data) . "\t ,";
                unset($data);
            }

            $html .= implode("\n", $user) . "\n";

            return $html;
        }

    function wxapp_house_export_parse_zan($cards) {
        if (empty($cards)) {
            return false;
        }
        $header = array(
            'openid' => 'openid',
            'name' => '用户名称','phone'=>'手机号','dw'=>'单位','zw'=>'职务','address'=>'地址'
        );
        $keys = array_keys($header);
        $html = "\xEF\xBB\xBF";
        foreach ($header as $li) {
            $html .= $li . "\t ,";
        }
        $html .= "\n";
        $count = count($cards);
        $pagesize = ceil($count / 5000);
        for ($j = 1; $j <= $pagesize; $j++) {
            $list = array_slice($cards, ($j - 1) * 5000, 5000);
            if (!empty($list)) {
                $size = ceil(count($list) / 500);
                for ($i = 0; $i < $size; $i++) {
                    $buffer = array_slice($list, $i * 500, 500);
                    $user = array();
                    foreach ($buffer as $row) {
                        $area = pdo_fetchcolumn("SELECT name FROM " . tablename('amouse_wxapp_category') . " WHERE id=:id  limit 1", array(":id" => $row['categoryId']));
                        $row['categoryId'] = $area;
                        $row['createtime'] = date('Y-m-d H:i:s', $row['createtime']);
                        foreach ($keys as $key) {
                            $data[] = $row[$key];
                        }
                        $user[] = implode("\t ,", $data) . "\t ,";
                        unset($data);
                    }
                    $html .= implode("\n", $user) . "\n";
                }
            }
        }
        return $html;
    }

function mergeText_mobile($target, $data, $text)
{
    $font = IA_ROOT . "/web/resource/fonts/msyhbd.ttf";
    $colors = hex2rgb($data["color"]);

    $color = imagecolorallocate($target, $colors["red"], $colors["green"], $colors["blue"]);

    $res=imagettfbbox(16,0,$font,$text);
    logging_run($res);
    $x=(640-$res[2]*2)/2;

    //计算文字占用像素

    imagettftext($target, $data["size"], 0, $x, $data["top"] + $data["size"], $color, $font, $text);
    return $target;
}

function yuanjiao($imgpath) {
    $ext = pathinfo($imgpath);
    $src_img = null;
    switch ($ext['extension']) {
        case 'jpg':
            $src_img = imagecreatefromjpeg($imgpath);
            break;
        case 'png':
            $src_img = imagecreatefrompng($imgpath);
            break;
    }
    $wh = getimagesize($imgpath);
    $w = $wh[0];
    $h = $wh[1];
    $w = min($w, $h);
    $h = $w;
    $img = imagecreatetruecolor($w, $h);
    //这一句一定要有
    imagesavealpha($img, true);
    //拾取一个完全透明的颜色,最后一个参数127为全透明
    $bg = imagecolorallocatealpha($img, 255, 255, 255, 127);
    imagefill($img, 0, 0, $bg);
    $r = $w / 2; //圆半径
    $y_x = $r; //圆心X坐标
    $y_y = $r; //圆心Y坐标
    for ($x = 0; $x < $w; $x++) {
        for ($y = 0; $y < $h; $y++) {
            $rgbColor = imagecolorat($src_img, $x, $y);
            if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r)) < ($r * $r))) {
                imagesetpixel($img, $x, $y, $rgbColor);
            }
        }
    }
    return $img;
}