因为做的是app的接口，里面的make_arr()方法是给前台的json格式数据

protected function make_arr($data, $message = '成功',$other = '0')
    {
        Tool::convertArrayNullValue($data);
        if($data && $other == '0') {
            $rdata['status'] = "1";
            $rdata['message'] = $message;
            $rdata['data'] = $data;
        }else if($other <> '0'){
            $rdata['status'] = $other;
            $rdata['message'] = $message;
        }else{
            $rdata['status'] = "0";
            $rdata['message'] = '失败';
        }
        return json_encode($rdata);
    }

base64图片上传
$img是前台给的图片base64

public function upfile(){
        $img = I('img');//图片base64    用 ”|“符号隔开
        $img = explode('|', $img);
        if($img){
            foreach($img as $v){
                $base64_img = trim($v);
                $up_dir = 'Public/Console/images/home/'.date('Y',time()).'/'.date('m',time());
                if(!is_dir($up_dir)){
                    mkdir($up_dir,0777,true);
                }
                if(preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_img, $result)){
                    $type = $result[2];
                    if(in_array($type,array('pjpeg','jpeg','jpg','gif','bmp','png'))){
                        $new_name = time().uniqid();
                        $new_file = $up_dir.'/'.$new_name.'.'.$type;
                        
                        $base64_1 = str_replace($result[1],'', $base64_img);
                        if(file_put_contents($new_file, base64_decode($base64_1))){
                            $pic = '/'.$new_file;
                            $nnpic = $pic.','.$nnpic;
                        }else{
                            echo $this->make_arr('','上传失败','0');die;
                        }
                        
                    }else{
                        //文件类型错误
                        echo $this->make_arr('','文件类型错误','2');die;
                    }
                }else{  
                    //文件错误
                    echo $this->make_arr('','base64错误','3');die;
                }
            }
            if($nnpic){
               echo $this->make_arr($nnpic,'成功');die;  //返回用逗号隔开的上传后的图片路径
            }
        }else{
            echo $this->make_arr('','参数错误','4');die;
        }
    }