开发笔记:yii2文件上传

//模型
php
namespace backendmodels;
use Yii;
use yiiwebUploadedFile;
class UploalModel extends yiidbActiveRecord
{
/**
* @var UploadedFile|Null file attribute
*/
public $file;
/**
* @return array the validation rules.
*/
public function rules()
{
return [
[["file"], "file",],
];
}
/**公共上传 上传信息(数组) 文件名称 大小 后缀名限制 上传后保存的名字 update时为更新图片 删除原有图片*/
public function upload($img,$name = ‘/vessel‘,$siez = ‘‘,$arr_type = ‘‘,$text_name = ‘‘,$act=‘update‘,$url=‘/vessel/20180831/153571385083726.jpg‘)
{
$path = ‘../..‘;
$dirname = $path.$name;
$fill=$this->file->extension;//图片的名字只取后缀名
if(empty($text_name)){
$ran=time().rand(10000,99999);//随机名字
}else{$ran = $text_name;}
$arr = $arr_type;
if(!empty($arr)){
if(!in_array($fill,$arr)){ return json_encode(‘格式不正确‘);}
}
//定义上传大小和类型
if(!empty($siez)){
if($img[‘size‘]>$siez) {return json_encode(‘文件大小超过限制‘);}
}
//文件上传存放的目录
$dir=$dirname.‘/‘.date("Ymd");
$dir_sev=$name.‘/‘.date("Ymd");/*数据库存储路径*/
if(!file_exists($dir)) {
mkdir($dir,0777,true);
}
if ($this->validate()) {
//文件名
$fileName = $ran .‘.‘.$fill;
$dir = $dir."/". $fileName;
if($act == ‘update‘){if($this->file->saveAs($dir)){@unlink($path.$url);}}/*删除图片*/
$uploadSuccessPath = $dir_sev."/". $fileName;/*最后路径*/
return $uploadSuccessPath;
}
}
}

//控制器
php
namespace backendcontrollers;
use Yii;
use backendmodelsUploalModel;
use yiiwebUploadedFile;
class TestController extends yiiwebController
{
/**
* 文件上传
* 我们这里上传成功后把图片的地址进行返回
*/
public function actionIndex ()
{
$model = new UploalModel();
$uploadSuccessPath = "";
if (Yii::$app->request->isPost) {
$model->file = UploadedFile::getInstance($model, "file");
$file = $model->upload((array)$model->file);
return $file;
}
return $this->render("index", [
"model" => $model,
"uploadSuccessPath" => $uploadSuccessPath,
]);
}
}

//视图
php
use yiiwidgetsActiveForm;
$form = ActiveForm::begin(["options" => ["enctype" => "multipart/form-data"]]);
?>


Submit
end(); ?>