使用单输入上传多个图像时，Codeigniter验证不起作用

问题描述：

I am trying to upload multiple images in codeigniter using single input its working fine but i also want to add codeigniter validation on this input field but it not works. Here's my html code,

<input type="file" name="images[]" id="file" multiple="">

And Here's my codeigniter Code,

if (empty($_FILES['images']['name']))
{
    $this->form_validation->set_rules('images', 'Item Image', 'required');
}

Can anyone please tell me why this validation not working when i try to change images name to images[] in codeigniter then this will always says image is required rather the image is selected.

答

Create the validation function yourself using callback:

public function index()
{
    $this->load->helper('file');
    $this->load->library('form_validation');
    if($this->input->post('submit'))
    {
        $this->form_validation->set_rules('file', '', 'callback_file_check');
        if($this->form_validation->run() == TRUE)
        {
            // Upload
        }
    }
    $this->load->view('upload');
}

public function file_check($str)
{
    $allowed_mime_type_arr = array('image/gif','image/jpeg','image/png');
    $mime = get_mime_by_extension($_FILES['file']['name']);
    if(isset($_FILES['file']['name']) && $_FILES['file']['name']!="")
    {
        if(in_array($mime, $allowed_mime_type_arr))
        {
            return TRUE;
        }
        else
        {
            $this->form_validation->set_message('file_check', 'Please select only gif/jpg/png file.');
            return FALSE;
        }
    }
    else
    {
        $this->form_validation->set_message('file_check', 'Please choose a file to upload.');
        return FALSE;
    }
}

答

Try to apply validation on the count of $_FILES['images']['name'].

if (count($_FILES['images']['name']) < 1)
{
   $this->form_validation->set_rules('images', 'Item Image', 'required');
}

答

Try this code

if (count($_FILES['images']['name']) == 0)
{
     $this->form_validation->set_rules('images', 'Item Image', 'required');
}

答

Your input name is name="images[]" So try this one...

$this->form_validation->set_rules('images[]', 'Item Image', 'required');

So you can call form validation when you have no files on POST.

if(count($_FILES['images']['name']) < 1) {
    $this->form_validation->set_rules('images[]', 'Item Image', 'required');
}else {
   // upload files
}

使用单输入上传多个图像时，Codeigniter验证不起作用

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