Codeignitor从动态表单上传多个输入文件

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

public function upload_files() {
    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|png';
    $config['max_size'] = 1024; // 限制文件大小，单位为KB

    $this->load->library('upload', $config);

    if (!$this->upload->do_upload('userfiles')) {
        $error = $this->upload->display_errors();
        // 处理上传错误
    } else {
        $data = $this->upload->data();
        // 处理上传成功
    }
}

public function upload_files() {
    // ...

    $files = $_FILES['userfiles'];
    $file_count = count($files['name']);

    for ($i = 0; $i < $file_count; $i++) {
        $_FILES['userfile']['name'] = $files['name'][$i];
        $_FILES['userfile']['type'] = $files['type'][$i];
        $_FILES['userfile']['tmp_name'] = $files['tmp_name'][$i];
        $_FILES['userfile']['error'] = $files['error'][$i];
        $_FILES['userfile']['size'] = $files['size'][$i];

        if (!$this->upload->do_upload('userfile')) {
            $error = $this->upload->display_errors();
            // 处理上传错误
        } else {
            $data = $this->upload->data();
            // 处理上传成功
        }
    }
}