Issue with file uploader - php

Question

I have the following code in a controller function (this is CI):
if(!empty($_FILES['filename']) && is_uploaded_file($_FILES['filename']['tmp_name'])) {
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = '1000';
$config['max_width'] = '1024';
$config['max_height'] = '768';
$this->load->library('upload', $config);
$this->upload->overwrite = true;
if ( ! $this->upload->do_upload('filename')){
$error = array('error' => $this->upload->display_errors());
var_dump($error);
exit;
}
else {
$this->upload->do_upload('filename');
$upload_info = $this->upload->data();
var_dump($upload_info);
exit;
}
}
This should work, it return no errors, and returns the $upload_info array before I exit(); (exit is here for debugging). The $upload_info array suggests that the file has been passed to the correct path on the server. The folder permissions are set to 777 on this folder.
However, the file does not appear on the server! Could anyone suggest what the issue might be here. All the correct libraries have also been loaded.

Answer 1

You call for $this->upload->do_upload('filename') twice.
First time in if and then second time in else-branch.
You should remove second $this->upload->do_upload('filename').
Final code:
if ( ! $this->upload->do_upload('filename')){
$error = array('error' => $this->upload->display_errors());
var_dump($error);
exit;
}
else {
$upload_info = $this->upload->data();
var_dump($upload_info);
exit;
}