YII2框架实现表单中上传单个文件的方法示例

CREATE TABLE `tb_user` (
 `id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '用户ID',
 `name` varchar(32) DEFAULT '' COMMENT '用户名',
 `pwd` varchar(64) DEFAULT '' COMMENT '密码',
 `head_img` varchar(256) DEFAULT '' COMMENT '图像',
 `sex` tinyint(1) DEFAULT '0' COMMENT '性别(0:男,1:女)',
 `age` tinyint(3) DEFAULT '0' COMMENT '年龄',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';

?php
use yii\helpers\Url;
?>
!doctype html>
html lang="zh-CN">
head>
  meta charset="UTF-8">
  title>表单提交/title>
/head>
body>
form action="?php echo Url::toRoute('index/index'); ?>" method="post" enctype="multipart/form-data">
  姓名：input type="text" name="name">br>
  密码：input type="password" name="pwd">br>
  性别：input type="radio" name="sex" value="0" checked>男
     input type="radio" name="sex" value="1">女br>
  年龄：input type="number" name="age">br>
  头像：input type="file" name="head_img">br>
  input type="submit" value="提交">
  input name="_csrf" type="hidden" value="?php echo \Yii::$app->request->csrfToken; ?>">
/form>
/body>
/html>

?php

namespace app\models;

use yii\db\ActiveRecord;
use yii\web\UploadedFile;

class MyUser extends ActiveRecord
{
  //注意这里的上传路径是相对你入口文件
  const UPLOAD_PAHT = 'uploads/';

  //返回你要操作的数据表名
  public static function tableName()
  {
    return '{{%user}}';
  }

  //设置规则，验证表单数据
  public function rules()
  {
    return [
      ['name', 'required', 'message' => '请填写用户名'],
      ['pwd', 'string', 'length' => [6, 12], 'message' => '密码6-12位'],
      ['sex', 'in', 'range' => [0, 1], 'message' => '正确选择性别'],
      ['age', 'integer', 'min' => 1, 'max' => 120, 'message' => '正确填写年龄'],
      ['head_img', 'image', 'extensions' => ['png', 'jpg', 'gif'], 'maxSize' => 1024 * 1024 * 1024, 'message' => '请上传头像'],
    ];
  }

  //上传头像
  public function uploadHeadImg()
  {
    //'head_img'这个字符串必须跟你表单中file控件的name字段相同
    $head_img = UploadedFile::getInstanceByName('head_img');
    if (!empty($head_img)) {
      $filePath = self::UPLOAD_PAHT . date('Ymd') . '/';
      //判断文件上传路径，如果不存在，则创建
      if (!file_exists($filePath)) {
        @mkdir($filePath, 0777, true);
        @chmod($filePath, 0777);
      }
      //文件名，我们通过md5文件名加上扩展名
      $fileName = md5($head_img->baseName) . '.' . $head_img->extension;
      $file = $filePath . $fileName;
      //保存文件到我们的服务器上
      $head_img->saveAs($file);
      //返回服务器上的文件地址
      return $file;
    } else {
      return false;
    }
  }
}

?php

namespace app\controllers;

use YII;
use yii\web\Controller;

class IndexController extends Controller
{
  public function actionIndex()
  {
    if (YII::$app->request->isPost) {
      $user = new \app\models\MyUser();

      //把POST过来的数据加载到user对象
      $data = YII::$app->request->post();
      //注意第二个参数设为''，默认YII的ActiveForm创建的表单元素会加上下标
      $user->load($data, '');

      if ($user->validate()) {
        $user->pwd = YII::$app->security->generatePasswordHash($user->pwd);
        $user->head_img = $user->uploadHeadImg();

        //这里保存时设为false不验证，因为pwd加密了
        $user->save(false);
      } else {
        var_dump($user->errors);
      }
    } else {
      return $this->renderPartial('index');
    }
  }
}