《PHP应用：Yii2使用表单上传文件的实例代码》要点：
本文介绍了PHP应用：Yii2使用表单上传文件的实例代码，希望对您有用。如果有疑问，可以联系我们。
相关主题：YII框架
PHP编程yii2用表单上传文件经常用到的,该怎样上传呢?
PHP编程1、单个文件上传
PHP编程首先建立一个模型models/UploadForm.php,内容如下
PHP编程
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'],
];
}
}
PHP编程再建立一个视图文件,内容如下
PHP编程
<?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() ?>
PHP编程最后建立控制器文件,内容如下
PHP编程
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' => $model]);
}
}
PHP编程注意这里我们没有用model->load(...),而是用了UploadedFile::getInstance(...).区别是后者不会执行$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.
PHP编程一些可选的配置选项
PHP编程上传文件不能为空
PHP编程
public function rules()
{
return [
[['file'], 'file', 'skipOnEmpty' => false],
];
}
PHP编程上传类型,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
PHP编程
public function rules()
{
return [
[['file'], 'file', 'extensions' => 'jpg, png', 'mimeTypes' => 'image/jpeg, image/png',],
];
}
PHP编程2、多文件上传
PHP编程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
PHP编程Model：
PHP编程
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!
];
}
}
PHP编程View：
PHP编程
<?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(); ?>
PHP编程与单文件上传不同的是下面这句
PHP编程
$form->field($model, 'file[]')->fileInput(['multiple' => true])
PHP编程Controller:
PHP编程
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]);
}
}
PHP编程这样就可以实现多文件上传了.
PHP编程参考https://github.com/yiisoft/yii2/blob/master/docs/guide/input-file-upload.md
PHP编程以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持维易PHP.
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