类 yii\web\UploadedFile

                public function __construct($config = [])
{
    $this->_tempResource = ArrayHelper::remove($config, 'tempResource');
    parent::__construct($config);
}

            

                public function __toString()
{
    return $this->name;
}

            

                protected function copyTempFile($targetFile)
{
    $target = fopen($targetFile, 'wb');
    if ($target === false) {
        return false;
    }
    $result = stream_copy_to_stream($this->_tempResource, $target);
    @fclose($target);
    return $result;
}

            

                public function getBaseName()
{
    // https://github.com/yiisoft/yii2/issues/11012
    $pathInfo = pathinfo('_' . $this->name, PATHINFO_FILENAME);
    return mb_substr($pathInfo, 1, mb_strlen($pathInfo, '8bit'), '8bit');
}

            

                public function getExtension()
{
    return strtolower(pathinfo($this->name, PATHINFO_EXTENSION));
}

            

                public function getHasError()
{
    return $this->error != UPLOAD_ERR_OK;
}

            

                public static function getInstance($model, $attribute)
{
    $name = Html::getInputName($model, $attribute);
    return static::getInstanceByName($name);
}

            

                public static function getInstanceByName($name)
{
    $files = self::loadFiles();
    return isset($files[$name]) ? new static($files[$name]) : null;
}

            

                public static function getInstances($model, $attribute)
{
    $name = Html::getInputName($model, $attribute);
    return static::getInstancesByName($name);
}

            

                public static function getInstancesByName($name)
{
    $files = self::loadFiles();
    if (isset($files[$name])) {
        return [new static($files[$name])];
    }
    $results = [];
    foreach ($files as $key => $file) {
        if (strpos($key, "{$name}[") === 0) {
            $results[] = new static($file);
        }
    }
    return $results;
}

            

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

            

                public function saveAs($file, $deleteTempFile = true)
{
    if ($this->hasError) {
        return false;
    }
    $targetFile = Yii::getAlias($file);
    if (is_resource($this->_tempResource)) {
        $result = $this->copyTempFile($targetFile);
        return $deleteTempFile ? @fclose($this->_tempResource) : (bool) $result;
    }
    return $deleteTempFile ? move_uploaded_file($this->tempName, $targetFile) : copy($this->tempName, $targetFile);
}