如何在codeiginter中上传多张照片？

<form method="post" action="upload_handler" enctype="multipart/form-data">
    <input type="file" name="photos[]" multiple>
    <input type="submit" value="Upload">
</form>

public function upload_handler()
{
    $photos = $_FILES['photos'];
    $upload_path = '/path/to/upload/directory/';

    foreach ($photos['tmp_name'] as $key => $tmp_name) {
        $file_name = $photos['name'][$key];
        $file_path = $upload_path . $file_name;

        if (move_uploaded_file($tmp_name, $file_path)) {
            // 上传成功
        } else {
            // 上传失败
        }
    }
}

$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = 1024; // 限制文件大小为1MB
$this->load->library('upload', $config);