yii\web\UploadedFile::reset PHP Метод

    public static function reset()
    {
        self::$_files = null;
    }

 public function generateFiles($types)
 {
     $_FILES = [];
     UploadedFile::reset();
     foreach ($types as $index => $type) {
         $file = "file.{$type}";
         $path = Yii::getAlias("@tests/files/{$file}");
         $_FILES["UploadForm[file][{$index}]"] = ['name' => $file, 'type' => mime_content_type($path), 'size' => filesize($path), 'tmp_name' => $path, 'error' => 0];
     }
 }