
Implement the `flipFlop()` function, which takes a string as input and, if that string is `'flip'`, it returns the string `'flop'`. Otherwise, the function needs to return `'flip'`.

Call examples:

```php
<?php

flipFlop('flip'); // 'flop'
flipFlop('flop'); // 'flip'
```

Try writing two versions of the function: one with the usual if-else, and one with a ternary operator.
