PHP base64 编码转化图片并进行指定路径的保存和上传处理

//    图片上传，将base64的图片转成二进制对象，塞进formdata上传
    function upload(basestr, type, $li) {
        var text = window.atob(basestr.split(",")[1]);
        var buffer = new Uint8Array(text.length);
        for (var i = 0; i < text.length; i++) {
            buffer[i] = text.charCodeAt(i);
        }
        var toUrl = "{:U('Order/ajaxUploadCommentImgs')}";
        $.post(
            toUrl,
            {'basestr':basestr},
            function (res) {
                if (res.status){
                    var imgStr = $(".imgStr").val();
                    $(".imgStr").val(imgStr+"^^"+res.message);
                }else {
                    layer.msg(res.message);
                }
            },'JSON'
        )
    }

public function ajaxUploadCommentImgs(){
        $postData = I('post.');
        if(IS_AJAX && IS_POST){
            $uploadUrl =  "Public/Upload";
            $tagUrl = $this->base64_image_content($postData['basestr'],$uploadUrl);
            if ($tagUrl){
                //TODO 将其写入数据库
                return showMsg(1,$tagUrl);
            }else{
                return showMsg(0,'图片上传失败！');
            }
        }else{
            return showMsg(0,"请求不合法！");
        }
    }

    /**
     * [将Base64图片转换为本地图片并保存]
     * @param $base64_image_content [要保存的Base64]
     * @param $path [要保存的路径]
     * @return bool|string
     */
    public function base64_image_content($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())."/";
            $basePutUrl = C('UPLOAD_IMG_BASE64_URL').$new_file;

            if(!file_exists($basePutUrl)){
                //检查是否有该文件夹，如果没有就创建，并给予最高权限
                mkdir($basePutUrl, 0700);
            }
            $ping_url = genRandomString(8).time().".{$type}";
            $ftp_image_upload_url = $new_file.$ping_url;
            $local_file_url = $basePutUrl.$ping_url;

            if (file_put_contents($local_file_url, base64_decode(str_replace($result[1], '', $base64_image_content)))){
            //TODO 个人业务的FTP 账号图片上传
            ftp_upload(C('REMOTE_ROOT').$ftp_image_upload_url,$local_file_url);
            return $ftp_image_upload_url;
            }else{
                return false;
            }
        }else{
            return false;
        }
    }

/**
 * 公用的方法  进行信息的提示
 */
function showMsg($status, $message, $data = array())
{
    $result = array(
        'status' => $status,
        'message' => $message,
        'data' => $data
    );
    exit(json_encode($result));
}