Export with headers

When you have an Array:

```
Array(
    Array("name"=>"edi9999","age"=>20),    
    Array("name"=>"youssef","age"=>25),
    Array("name"=>"jeff","age"=>18)
);
```

it would be great to have an option to set the first line as being the header, eg 

```
name;age
edi9999;20
youssef;25
jeff;18
```

Is this possible now ?
