How to handle checkboxes

But you know where the files on the server located? You can echo your current directory

Code:

echo getcwd();

In your applications, do you send just images like image1, image2 ... ? If so, this would maybe easier

PHP Code:

<td>
<input type="checkbox" name="attachments[]" value="1">NUI-IR Laser Array Chip<br>
<input type="checkbox" name="attachments[]" value="2">LiDAR - IR Laser Array Field<br>
<input type="checkbox" name="attachments[]" value="3">Optical Solutions<br>
<input type="checkbox" name="attachments[]" value="4">None<br>
</td> 

foreach($this->input->post('attachments') as $attachement)
{
    $this->email->attach('/path.../uploads/2014/07/image'.$attachement.'.jpg');
}