代码点火器 2.x 可选文件上传问题"You did not select a file to upload"

Question

让我先描述我的代码。

查看：

<?php echo form_open_multipart('question_edit/update_question'); ?>
  ....
  <div class="form-group">
      <label for="ask_q" class="">A Brief Description of your question <em>(Optional)</em></label>
       <textarea name="ask_q" id="ask_q"><?php echo $uposts->question_desc; ?></textarea>
  </div>
  <div class="form-group">
      <label for="upld" class="">Upload New Docs <em>(Optional)</em></label>
      <input type="file" name="upld[]" id="upld" style="width: 100%;" multiple>
  </div>
  ....
<?php echo form_close(); ?>

请注意，我的文件输入字段不是强制性的。它是可选。

控制器：

function update_question(){
    $update_data = array(
        'question_desc'   =>  $this->input->post('ask_q')
    );
    $this->ask_model->update_q($update_data);
    if(!empty($_FILES['upld']['name'])){
        $filesCount = count($_FILES['upld']['name']);
        for($i = 0; $i < $filesCount; $i++){
            $_FILES['userFile']['name'] = $_FILES['upld']['name'][$i];
            $_FILES['userFile']['type'] = $_FILES['upld']['type'][$i];
            $_FILES['userFile']['tmp_name'] = $_FILES['upld']['tmp_name'][$i];
            $_FILES['userFile']['error'] = $_FILES['upld']['error'][$i];
            $_FILES['userFile']['size'] = $_FILES['upld']['size'][$i];
            $uploadPath = './uploads/';
            $config['upload_path'] = $uploadPath;
            $config['allowed_types'] = 'gif|jpg|jpeg|png|doc|docx|xls|xlsx|ppt|pptx|csv|ods|odt|odp|pdf|rtf|txt';
            $config['max_size'] = '1048576';
            $this->upload->initialize($config);
            if(!$this->upload->do_upload('userFile')){
                $this->session->set_flashdata('q_failure', 'Something went wrong. Please try again.');
                redirect('/user-qa');
            } else {
                $fileData = $this->upload->data();
                $uploadData[$i]['uploaded_file'] = $fileData['file_name'];
            }
        }
        if(!empty($uploadData)){
            //Insert files data into the database
            $insert = $this->ask_model->insert_upload($uploadData);
        }
    }
    $this->session->set_flashdata('q_success', '<div class="alert-message success">
            <i class="icon-ok"></i>
            <p><span>Success</span><br>
            Your question has been updated successfully.</p>
        </div>');
    redirect('/user-dashboard');
}

我的控制器代码描述（？）如果文件上传字段不是空的，则上传文件。

但是问题是每次我提交表单时，它都会因为$this->ask_model->update_q($update_data);而更新数据库，但是给出了我用于验证$config的错误消息Something went wrong. Please try again.。

我检查了日志文件。日志文件状态

You did not select a file to upload

看来，我的if(!empty($_FILES['upld']['name'])){不起作用。

update-1

我尝试了if(isset($_FILES['upld']) && $_FILES['upld']['size'] > 0){而不是if(!empty($_FILES['upld']['name'])){，但结果是相同的。

我的问题是

1. 问题在哪里？
2. 如何验证文件大小和文件扩展名类型？

update-2

通过查看此stackoverflow链接尝试if($_FILES['upld']['name']){，但也无法正常工作。

Answer 1

原因是当您提交空的多个表单时，它将带有索引0的空数组因此，我们确保第一个索引不是空

if(isset($_FILES['files']['name'])&&!empty($_FILES['files']['name'][0])):