Yii2实现UploadedFile上传文件示例

loadFiles()方法，把$_FILES中的键值作为参数传递到loadFilesRecursive（$key, $names, $tempNames, $types, $sizes, $errors） 中

/**
   * Creates UploadedFile instances from $_FILE.
   * @return array the UploadedFile instances
   */
  private static function loadFiles()
  {
    if (self::$_files === null) {
      self::$_files = [];
      if (isset($_FILES) && is_array($_FILES)) {
        foreach ($_FILES as $class => $info) {
          self::loadFilesRecursive($class, $info['name'], $info['tmp_name'], $info['type'], $info['size'], $info['error']);
        }
      }
    }
    return self::$_files;
  }

loadFilesRecursive方法，通过递归把$_FILES中的内容保存到  self::$_files 中

/**
   * Creates UploadedFile instances from $_FILE recursively.
   * @param string $key key for identifying uploaded file: class name and sub-array indexes
   * @param mixed $names file names provided by PHP
   * @param mixed $tempNames temporary file names provided by PHP
   * @param mixed $types file types provided by PHP
   * @param mixed $sizes file sizes provided by PHP
   * @param mixed $errors uploading issues provided by PHP
   */
  private static function loadFilesRecursive($key, $names, $tempNames, $types, $sizes, $errors)
  {
    if (is_array($names)) {
      foreach ($names as $i => $name) {
        self::loadFilesRecursive($key . '[' . $i . ']', $name, $tempNames[$i], $types[$i], $sizes[$i], $errors[$i]);
      }
    } elseif ($errors !== UPLOAD_ERR_NO_FILE) {
      self::$_files[$key] = new static([
        'name' => $names,
        'tempName' => $tempNames,
        'type' => $types,
        'size' => $sizes,
        'error' => $errors,
      ]);
    }
  }

实例:

html

<form class="form-horizontal form-margin50" action="<?= yiihelpersUrl::toRoute('upload-face') ?>"
          method="post" enctype="multipart/form-data" id="form1">
         <input type="hidden" name="_csrf" value="<?= Yii::$app->request->getCsrfToken() ?>">
         <input type="file" name="head_pic" id="doc" style="display: none" onchange="setImagePreview()"/>
 </form>

php代码,打印的

public static function uploadImage($userId = '', $tem = '')
  {
    $returnPath = '';
    $path = 'uploads/headpic/' . $userId;
    if (!file_exists($path)) {
      mkdir($path, 0777);
      chmod($path, 0777);
    }

    $patch = $path . '/' . date("YmdHis") . '_';
    $tmp = UploadedFile::getInstanceByName('head_pic');
    if ($tmp) {
      $patch = $path . '/' . date("YmdHis") . '_';
      $tmp->saveAs($patch . '1.jpg');
      $returnPath .= $patch;
    }

    return $returnPath;
  }

打印dump($tmp,$_FILES,$tmp->getExtension());

对应的 UploadedFile