yii2用表单上传文件经常用到的，该怎样上传呢？
1、单个文件上传
首先建立一个模型models/uploadform.php,内容如下
namespace appmodels;
use yiibasemodel;
use yiiwebuploadedfile;
/**
* 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 yiiwidgetsactiveform;
?>
<?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 appcontrollers;
use yii;
use yiiwebcontroller;
use appmodelsuploadform;
use yiiwebuploadedfile;
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 yiiwidgetsactiveform;
$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 appcontrollers;
use yii;
use yiiwebcontroller;
use appmodelsuploadform;
use yiiwebuploadedfile;
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
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