Codeigniter upload optional - php

Question

I looked for this in Google and different answers on stackoverflow. And probaly there is an good answer in them but still i don't get how i can implent it in my own code.
I got my own public function to upload an image, but now i want it to be optional. At this moment someone needs to upload an file to pass the validation, how can i make this optional?
my function:
public function _do_upload_image()
{
$config['upload_path'] = './company_images/';
$config['allowed_types'] = 'jpg|jpeg|png';
$this->load->library('upload', $config);
if (!$this->upload->do_upload())
{
$this->form_validation->set_message('_do_upload_image', $this->upload->display_errors());
}
else
{
$this->_upload_data = $this->upload->data();
}
}
Thanks in advance
--edit--
For other people, the answer worked and i gave my file_name an other name when there was no image uploaded. It looks like this:
public function _do_upload_image()
{
$config['upload_path'] = './company_images/';
$config['allowed_types'] = 'jpg|jpeg|png';
$returnArr = array();
$this->load->library('upload', $config);
if (!$this->upload->do_upload())
{
$returnArr = array('file_name' => 'leeg.jpg');
}
else
{
$returnArr = $this->upload->data();
}
$this->_upload_data = $returnArr;
}

Answer 1

If you mean you need to make your upload function optional then you can just do:
public function _do_upload_image()
{
$config['upload_path'] = './company_images/';
$config['allowed_types'] = 'jpg|jpeg|png';
$returnArr = array();
$this->load->library('upload', $config);
if ($this->upload->do_upload())
{
$returnArr = $this->upload->data();
}
return $returnArr; //just return the array, empty if no upload, file data if uploaded
}
Hope that makes sense

Answer 2

codeigniter file upload optionally ...works perfect..... :)
---------- controller ---------
function file()
{
$this->load->view('includes/template', $data);
}
function valid_file()
{
$this->form_validation->set_rules('userfile', 'File', 'trim|xss_clean');
if ($this->form_validation->run()==FALSE)
{
$this->file();
}
else
{
$config['upload_path'] = './documents/';
$config['allowed_types'] = 'gif|jpg|png|docx|doc|txt|rtf';
$config['max_size'] = '1000';
$config['max_width'] = '1024';
$config['max_height'] = '768';
$this->load->library('upload', $config);
if ( !$this->upload->do_upload('userfile',FALSE))
{
$this->form_validation->set_message('checkdoc', $data['error'] = $this->upload->display_errors());
if($_FILES['userfile']['error'] != 4)
{
return false;
}
}
else
{
return true;
}
}
i just use this lines which makes it optionally,
if($_FILES['userfile']['error'] != 4)
{
return false;
}
$_FILES['userfile']['error'] != 4 is for file required to upload.
you can u make it unneccessory by using $_FILES['userfile']['error'] != 4 , then it will pass this error for file required and
works great with other types of errors if any by using return false ,
hope it works for u ....