How to transfer pictures through php interface

Question: When the APP uploads an avatar, how should PHP, as the API end, receive the image information?

#The upload part of the code is not a problem, the main problem is how the server side can receive the image information from the APP side. Under the B/S architecture, you can set enctype="multipart/form-data" directly through the form form, and the image information will be in the $_FILES array. So is this also true in C/S mode? (Recommended learning: PHP video tutorial)

Answer 1 (see method 1): Generally, binary stream transmission is used. The client transmits binary data, the server receives it, and then file_put_contents just writes the file. The file name format and where to put the file are all defined by yourself.

Answer 2 (see method 2): The Android or IOS client simulates an HTTP Post request to the server. After the server receives the corresponding Post request (obtain image resources through $_FILES ), return response information to the client. (This method is the same as the method of obtaining Html submission)

Base64 encrypt the image into a string for transmission

Instructions: IOS or Android side: Base64 encode the image to obtain a string, and pass it to the interface

Interface side: Base64 decode the received string, and then upload it to the specified location through the file_put_contents function

/**
     * 图片上传
     * @param $imginfo - 图片的资源，数组类型。['图片类型','图片大小','图片进行base64加密后的字符串']
     * @param $companyid - 公司id
     * @return mixed
     */
    public function uploadImage( $imginfo , $companyid ) {
        $image_type = strip_tags($imginfo[0]);  //图片类型
        $image_size = intval($imginfo[1]);  //图片大小
        $image_base64_content = strip_tags($imginfo[2]); //图片进行base64编码后的字符串

        $upload = new UploaderService();
        $upconfig = $upload->upconfig;

        if(($image_size > $upconfig['maxSize']) || ($image_size == 0)) {
            $array['status'] = 13;
            $array['comment'] = "图片大小不符合要求！";
            return $array;
        }

        if(!in_array($image_type,$upconfig['exts'])) {
            $array['status'] = 14;
            $array['comment'] = "图片格式不符合要求！";
            return $array;
        }

        // 设置附件上传子目录
        $savePath = 'bus/group/' . $companyid . '/';
        $upload->upconfig['savePath'] = $savePath;

        //图片保存的名称
        $new_imgname = uniqid().mt_rand(100,999).'.'.$image_type;

        //base64解码后的图片字符串
        $string_image_content = base64_decode($image_base64_content);

        // 保存上传的文件
        $array = $upload->upload($string_image_content,$new_imgname);

        return $array;
    }

// 上传配置信息
    public $upconfig = array(
        'maxSize'    =>    3145728,         //3145728B（字节） = 3M
        'exts'       =>    array('jpg', 'gif', 'png', 'jpeg'),
//        'rootPath'   =>    './Public/Uploads/info/',
        'rootPath'   =>    'https://www.eyuebus.com/Public/Uploads/info/',
    );

    /**
     * @param $string_image_content - 所要上传图片的字符串资源
     * @param $new_imgname - 图片的名称，如：57c14e197e2d1744.jpg
     * @return mixed
     */
    public function upload($string_image_content,$new_imgname) {

        $res['result'] = 1;
        $res['imgurl'] = '';
        $res['comment'] = '';

        do {
            $ret = true;
            $fullPath = $this->upconfig['rootPath'] . $this->upconfig['savePath'];
            if(!file_exists($fullPath)){
                $ret = mkdir($fullPath, 0777, true);
            }
            if(!$ret) {
                // 上传错误提示错误信息
                $res['result'] = 12;
                $res['comment'] = "创建保存图片的路径失败！";
                return $res;
                break;
            }

            //开始上传
            if (file_put_contents($fullPath.$new_imgname, $string_image_content)){
                // 上传成功 获取上传文件信息
                $res['result'] = 0;
                $res['comment'] = "上传成功！";
                $res['imgname'] = $new_imgname;
            }else {
                // 上传错误提示错误信息
                $res['result'] = 11;
                $res['comment'] = "上传失败！";
            }


        } while(0);

        return $res;
    }

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