Format of arrays

What format should the arrays have in the tutorial?

Option 1:

```
$array = array('key1' => 'value',
               'key2' => 'value',
               );
```

Option 2:

```
$array = array(
    'key1' => 'value',
    'key2' => 'value',
);
```

Option 3:

```
$array = array('key1' => 'value',
               'key2' => 'value' );
```
