Upload problem with PHP: Thumbnail picking up the image name - php

Question

I have the following model(codeigniter) code to upload image and thumbnail.
However the result of image path becomes, images/comfort_big.jpg and images/comfort_big.jpg.jpg.
The thumbnail image picks up the name of image and add .jpg.
I am uploading images/confort_thumb.jpg for thumb.
Can anyone tell me what's wrong please?
if ($_FILES){
$config['upload_path'] = './images/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = '200';
$config['remove_spaces'] = true;
$config['overwrite'] = false;
$config['max_width'] = '0';
$config['max_height'] = '0';
$this->load->library('upload', $config);
if (strlen($_FILES['image']['name'])){
if(!$this->upload->do_upload('image')){
$this->upload->display_errors();
exit();
}
$image = $this->upload->data();
if ($image['file_name']){
$data['image'] = "images/".$image['file_name'];
}
}
if (strlen($_FILES['thumbnail']['name'])){
if(!$this->upload->do_upload('thumbnail')){
$this->upload->display_errors();
exit();
}
$thumb = $this->upload->data();
if ($thumb['file_name']){
$data['thumbnail'] = "images/".$thumb['file_name'];
}
}
}

Answer 1

I had a quick look at File Uploading Class in the user guide
In the preferences tables it states:
Note:The filename should not include a file extension.
So my guess is that you get the user to name the file
$config['file_name'] = "User defined";
or remove the extension programmatically. Since you know and list the extensions already you could do
$types = array(".gif",".jpg",".png");
$image['file_name'] = str_replace($types , "", $image['file_name'] );

Answer 2

Your problem is that when you create a thumb you are passing the full image.
So it will add another extension to it.
Use Below code to remove extension from file name.
<?php
$filename=$image['file_name'];
$file_name_with_dot = substr($filename,0, strrpos($filename, '.') + 1);
$only_file_name = substr($file_name_with_dot,0,strlen($file_name_with_dot)-1);
?>
Now pass this $only_file_name variable to your thumb function..
It will be better to use automatic thumb creation from main image.
Hope this will help for you.