Unlink function has not been successful with codeigniter - codeigniter

Question

I want to delete the image long after I update the new image. I have added unlink(), but the old image is not deleted.
Controller :
public function Update()
{
$id = $this->input->post('id');
$name = $this->input->post('name');
if($_FILES['image']['name']!="")
{
$config['upload_path'] = './image/';
$config['allowed_types'] ='gif|jpg|png|jpeg|jpe|pdf|doc|docx|rtf|text|txt';
$this->load->library('upload', $config);
if($this->upload->do_upload('image')){
$uploadData = $this->upload->data();
$image = $uploadData['file_name'];
}else{
$image= '';
}
}else{
$image = '';
}
$data = array(
'name' => $name,
);
if($image != ''){
$data['image'] = $image;
unlink("./image/$row->file_name");
}
$this->model_user->update_user($data,$id);
}
Model :
public function update_user($data, $id)
{
$this->db->where('id', $id);
return $this->db->update('table_user', $data);
}

Answer 1

In your code, you are not getting old image name from DB
First, get the old image name and then try like this
if($image != ''){
$data['image'] = $image;
$oldimage = $this->model_user->get_oldimage($id);
unlink("path/to/directory/".$oldimage);
}
Model
public function get_oldimage($id){
return $this->db->get_where('table_user', ['id' => $id])->row()->image;
}