Delete uploaded file with a wrong name as the defined - php

Question

Below is my upload function in codeigniter. I can upload a file. I also check if the file name matches the url parameter. How do i delete the file if the name does not match the url. I have tried unlink function but it does not work
function do_upload() {
$this->makeDir();
$labref = $this->uri->segment(3);
$filename = 'xyz/'. date('Y').'/'.date('M').'/'. $labref .'/' . $labref . '.xlsx';
if (file_exists($filename)) {
$data['labref'] = $this->uri->segment(3);
$data['settings_view'] = 'analyst_file_present_v';
$this->base_params($data);
} else {
$config['upload_path'] = 'xyz/'. date('Y').'/'.date('M').'/'. $labref ;
$config['allowed_types'] = 'xls|xlsx';
$this->load->library('upload', $config);
$data= $this->upload->data();
if ($data['file_name']=="$labref.'.xlsx'") {
$this->SaveFileDetails();
$this->success();
}else{
$filename = 'xyz/'.date('Y').'/'.date('M').'/'. $labref.'/'.$labref.'xlsx' ;
unlink($filename);
echo 'You have uploaded a wrong file';
}
if (!$this->upload->do_upload('worksheet')) {
$data['labref'] = $this->uri->segment(3);
$data['error'] = $this->upload->display_errors();
$data['settings_view'] = 'upload_analyst_v';
$this->base_params($data);
}
}
}

Answer 1

You've got some pretty nasty quote mismatches:
if ($data['file_name']=="$labref.'.xlsx'") {
^-----^---
Since you're in a double-quoted string, those ' are going to become part of the filename. Perhaps you meant:
if ($data['file_name']== $labref .'.xlsx') {
instead? (note lack of ".

Answer 2

It seems to me you are trying to delete the wrong file.
You should replace:
$filename = 'xyz/'.date('Y').'/'.date('M').'/'. $labref.'/'.$labref.'xlsx' ;
with:
$filename = 'xyz/'.date('Y').'/'.date('M').'/'. $labref.'/' . $data['file_name'];
To delete the uploaded file.
Edit: You have to actually do the upload before you can access the errors and data so you should move your $this->upload->do_upload() block to before the if statement.