CodeIgniter-文件上传需要验证

我找到了一种完全符合我想要的解决方案。

我变了

$this->form_validation->set_rules('name', 'Name', 'trim|required');$this->form_validation->set_rules('pre', 'Code', 'trim|required');$this->form_validation->set_rules('userfile', 'document', 'required');

至

$this->form_validation->set_rules('name', 'Name', 'trim|required');$this->form_validation->set_rules('pre', 'Code', 'trim|required');if (empty($_FILES['userfile']['name'])){    $this->form_validation->set_rules('userfile', 'document', 'required');}