Is it somehow possible to "glue" two reference variables?

For example

```
$more = &$first.':'.&$second;

```

Using this, i receive a **syntax error**, an unexpected **&**.

Full code

```
$numOf = isset($_GET['numof']) ? $_GET['numof'] : 'x';

if($numOf == 1) {

$more = &$first;

} else if($numOf == 2) {

$more = &$first.':'.&$second;

} else {

$more = '';

}

$results = array(); // array with results from database

foreach($results as $res) {

$first = $res[0];
$second = $res[1];

echo $more.$res[3];

}

```