Codeigniter replace uploaded image - php

Question

I'm using Codeigniter's File Uploading Class for uploading user avatars. Is there a way to replace a user's image file whenever he/she uploads a new one? I want to replace an existing avatar with the newest one uploaded.
My image uploading controller
function upload_avatar()
{
$config['upload_path'] = './uploads/avatars/';
$config['allowed_types'] = 'jpg|png';
$config['overwrite'] = FALSE; //overwrite user avatar
$config['encrypt_name'] = TRUE;
$config['max_size'] = '200'; //in KB
$this->load->library('upload', $config);
if ( ! $this->upload->do_upload())
{
$error = $this->upload->display_errors();
$this->session->set_flashdata('error', $error);
redirect('/settings/avatar');
}
else
{
$config['image_library'] = 'gd2';
$config['source_image'] = $this->upload->upload_path.$this->upload->file_name;
$config['create_thumb'] = FALSE;
$config['maintain_ratio'] = FALSE;
$config['width'] = 120;
$config['height'] = 120;
$this->load->library('image_lib', $config);
$this->image_lib->crop();
//Add image path to database
$avatar_path = 'uploads/avatars/' . $this->upload->file_name;
$user_id = $this->tank_auth->get_user_id();
$this->Settings_model->update_avatar($avatar_path, $user_id);
$this->session->set_flashdata('success', 'Avatar updated!');
redirect('/settings/avatar');
}
}

Answer 1

There is a public attribute overwrite that dictates the decision to overwrite the original file. By default, a new filename is created based on the original. Here's the source from Upload.php in CI:
/*
* Validate the file name
* This function appends an number onto the end of
* the file if one with the same name already exists.
* If it returns false there was a problem.
*/
$this->orig_name = $this->file_name;
if ($this->overwrite == FALSE)
{
$this->file_name = $this->set_filename($this->upload_path, $this->file_name);
if ($this->file_name === FALSE)
{
return FALSE;
}
}
So all you need to do to get the overwrite working is:
$this->load->library('upload', $config);
$this->upload->overwrite = true;

Answer 2

Simple set "overide" be true in your config.
$this->upload->initialize(array(
"upload_path"=>$path,
"allowed_types"=>"jpg|png|jpeg",
"overwrite"=>true
));

Answer 3

did you try to change
$config['overwrite'] = FALSE;
to
$config['overwrite'] = TRUE;