I haven't given this much thought before but recently tried an sample code to c what happens when using extract() on an array with default key values, how is it supposed to work there. 

```
    $testArray = array("apple", "ant", "book", "bag");
    extract($testArray);

    print_r($testArray);

    echo "${1}";

```

where will be the values apple, ant, book, and bag stored after extract() is applied.

This is a simple question but somebody please help me solve it.