Tolerate comments as whitespace

Example code that was failing due to comments inside the function call:
```
//  Connect to the POP3 server
    $this->pop_conn = fsockopen($host,
//  POP3 Host
                  $port,    //  Port #

$errno,   //  Error Number
                  $errstr,  //  Error
Message
                  $tval);   //  Timeout (seconds)
```