yii2文件上传

use yii\web\UploadedFile;
public function uploadFile($filename,$target_path='base',$type_allow=[],$size_max=8388608){
            if(empty($type))
            {
                $type_allow=[
                    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',//xlsx
                    'application/vnd.ms-excel',//xls
                    'image/jpeg',//jpg/jpeg
                    'image/png',//png
                    'image/gif'//gif
                ];
            }
 
            $file = UploadedFile::getInstanceByName($filename);
            //查看文件是否上传到临时路径
            if(!$file->hasError)
            {
                //$original_name = $file->baseName();//原文件名
                //$realPath = $file->tempName;//临时文件的绝对路径
 
                $ext = $file->getExtension();//扩展名
 
                //判断文件类型
                $type = $file->type;//文件类型
                if(!in_array($type,$type_allow)) return ['code'=>'failure','error_msg'=>'文件类型不对'];
 
                //判断文件大小
                $size = $file->size;
                if($size>$size_max) return ['code'=>'failure','error_msg'=>'文件太大'];
 
                $filename = date('YmdHis').'-'.uniqid().'.'.$ext;
                $basePath = Yii::$app->basePath;//项目根目录
                $path = $basePath.'/uploads/'.$target_path;
                if (!file_exists($path)) {
                    mkdir($path, 0777);
                    chmod($path, 0777);
                }
                $saveAs = $file->saveAs($path. '/' . $filename);
                if($saveAs)
                {
                    return [
                        'code'         => 'successful',               //状态
                        'filename'     => $filename,                  //文件名
                        'path_name'    => 'uploads/'.$target_path.'/'.$filename, //相对路径文件名
                        'fullpath_name'=> $path.'/'.$filename,        //全路径文件名
                    ];
                }
                else {
                    return ['code'=>'failure','error_msg'=>'文件上传异常'];
                }
            }
            else{
                return ['code'=>'failure','error_msg'=>'文件上传失败'];
            }
 
        }