php上传图片，yii上传图片，（base64上传）

/**
     * 签名保存签名图片
     * */
    public function actionOrderSign(){
        $base64_string = $this->post("img");
        $base64_string = base64_decode($base64_string);
        $name = md5(uniqid() . time() . rand(0, 9999999));
        $name = strtoupper(base_convert(substr($name, rand(0, 24), 8), 16, 32)) . '.jpg';
        $paths = __FILE__;
        $paths = str_replace("\\",'/',$paths);
        $arr = explode('/', $paths);
        $status = 1;
        $path = '';
        foreach ($arr as $key=>$it){
            if($it != "apps" && $status != 2){
                if($key == 0){
                    $path = $it;
                }else{
                    $path .= '/'.$it;
                }
            }
            if($it == "apps"){
                $status = 2;
            }
        }
 
        $path = $path."/attached/public/sign/".date("Ymd");
        if (!file_exists($path)) {
            @mkdir($path, 0777, true);
        }
 
        file_put_contents($path . "/" . $name, $base64_string);
 
        return $this->renderJsonSuccess(200, ['msg' => '请求成功', 'data' => $path]);
    }