yii2框架中上传单(多)文件

1、单个文件上传

首先建立一个模型models/UploadForm.php,内容如下

namespace app\models;

use yii\base\Model;
use yii\web\UploadedFile;

/**
* UploadForm is the model behind the upload form.
*/
class UploadForm extends Model
{
/**
* @var UploadedFile file attribute
*/
public $file;

/**
* @return array the validation rules.
*/
public function rules()
{
return [
[['file'], 'file'],
];
}
}

再建立一个视图文件，内容如下

<?php
use yii\widgets\ActiveForm;
?>

<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]) ?>

<?= $form->field($model, 'file')->fileInput() ?>

<button>Submit</button>

<?php ActiveForm::end() ?>

最后建立控制器文件，内容如下

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
public function actionUpload()
{
$model = new UploadForm();

if (Yii::$app->request->isPost) {
$model->file = UploadedFile::getInstance($model, 'file');

if ($model->file && $model->validate()) {
$model->file->saveAs('uploads/' . $model->file->baseName . '.' . $model->file->extension);
}
}

return $this->render('upload', ['model' => $model]);
}
}

注意这里我们没有用model->load(...)，而是用了UploadedFile::getInstance(...)。区别是后者不会执行$model->validate()，所以需要手动的去执行$model->validate()来检验数据的合法性。如果检验通过了，上传的文件保存在uploads文件夹下，即web目录下的uploads里。一些可选的配置选项
上传文件不能为空

public function rules()
{
return [
[['file'], 'file', 'skipOnEmpty' => false],
];
}

上传类型，不仅可以根据扩展名检验，还可以根据文件的内容进行检验

public function rules()
{
return [
[['file'], 'file', 'extensions' => 'jpg, png', 'mimeTypes' => 'image/jpeg, image/png',],
];
}

2、多文件上传

如果你想一次上传多个文件，只需调节几个参数就可以达到目的Model：

class UploadForm extends Model
{
/**
* @var UploadedFile|Null file attribute
*/
public $file;

/**
* @return array the validation rules.
*/
public function rules()
{
return [
[['file'], 'file', 'maxFiles' => 10], // <--- here!
];
}
}

View：

<?php
use yii\widgets\ActiveForm;

$form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]);
?>

<?= $form->field($model, 'file[]')->fileInput(['multiple' => true]) ?>

<button>Submit</button>

<?php ActiveForm::end(); ?>

与单文件上传不同的是下面这句

$form->field($model, 'file[]')->fileInput(['multiple' => true])

Controller:

namespace app\controllers;

use Yii;
use yii\web\Controller;
use app\models\UploadForm;
use yii\web\UploadedFile;

class SiteController extends Controller
{
public function actionUpload()
{
$model = new UploadForm();

if (Yii::$app->request->isPost) {
$model->file = UploadedFile::getInstances($model, 'file');

if ($model->file && $model->validate()) {
foreach ($model->file as $file) {
$file->saveAs('uploads/' . $file->baseName . '.' . $file->extension);
}
}
}

return $this->render('upload', ['model' => $model]);
}
}

这样就可以实现多文件上传了。
参考https://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md