controlling and specification of loop items

i am using codeigniter to replace files in directory and update location in database, i have multiple files so when i update them all it works good updates and replaces all of them, but when i update one, or more specific files it updates and replaces all those retrieved from the database. it operates on all of them.
the controller:

PHP Code:

public function upload()
    {
        $config ['upload_path'] = 'uploads';
        $config ['allowed_types'] = 'gif|jpg|png';
        $config ['encrypt_name'] = TRUE;
        $config['overwrite'] = TRUE;

        $this->upload->initialize($config);

        $files = $_FILES;
        $cpt = count($_FILES ['images'] ['name']);

        for ($i = 0; $i < $cpt; $i++) {
            echo $i . '<br>';
            $image = Image::find($_POST['images']['id'][$i]);
            //$query = Image::find('id');
            if(file_exists("./uploads/$image->image_location")) {
                unlink("./uploads/$image->image_location");
            }
            $_FILES ['images'] ['name'] = $files ['images'] ['name'] [$i];
            $_FILES ['images'] ['type'] = $files ['images'] ['type'] [$i];
            $_FILES ['images'] ['tmp_name'] = $files ['images'] ['tmp_name'] [$i];
            $_FILES ['images'] ['error'] = $files ['images'] ['error'] [$i];
            $_FILES ['images'] ['size'] = $files ['images'] ['size'] [$i];

            if ($this->upload->do_upload('images')) {
                $upload_data = $this->upload->data();
                $file_name = $upload_data['file_name'];
                $image->update_attributes(array('image_location' => $file_name));
            } else {
                $this->upload->display_errors();
                //echo "$error";
            }

        }

    }

the view:

 <ul>
        <?php
        foreach($image as $row)
        {?>
            <?= form_hidden('images[id][]', set_value('id', isset($row->id)?$row->id:''))?>

        <label><input type="file" name="images[]" ><?php echo $row->image_location; ?></label>
        <?php }?>
    </ul> 


What is being posted to the server?