Array to string conversion error while file upload,Error is displaying but not success data - codeigniter-3

Question

My code is working fine on upload fail but on upload success error is thrown as undefined variable: data. Can anyone help me how I can pass the success data to view
public function index()
{
$this->load->view('Pdf', array('error' => ' ' ));
}
public function do_upload()
{
if($this->upload->do_upload())
{
$data['success']= $this->upload->data();
}
else
{
$data['error'] = $this->upload->display_errors();
}
}
view:
<?php echo $error;?>
<?php echo $data["file_name"];?>

Answer 1

When you upload using $this->upload->data(), you are get an Array as a result, not a variable or string.
e.g Below is an result array from Image upload.
Array
(
[file_name] =>
[file_type] =>
[file_path] =>
[full_path] =>
[raw_name] =>
[orig_name] =>
[client_name] =>
[file_ext] =>
[file_size] =>
[is_image] =>
[image_width] =>
[image_height] =>
[image_type] =>
[image_size_str] =>
)
And here you are printing an array using echo instead of print_r.
echo is used to give output the data.
print_r is used to print array.
So solution for this "Array to string conversion error while file upload" is,
Change echo $data["file_name"]; ==> print_r($data); or print_r($data['success'])