How can I have multiple cookies for each Client/PC to run a script?

If ComputerA run a script then cookies.txt will be created and also ComputerB run same Script then cookies.txt will be over written which is bad.

Example:

```
curl_setopt($ch,CURLOPT_COOKIEFILE,"cookie.txt");
curl_setopt($ch,CURLOPT_COOKIEJAR,"cookie.txt");

```