
Implement a function, `guessNumber()`, which takes a number and checks if the number is equal to a given number (let it be 42). If it's equal, the function should return the string `'You win!'`, otherwise, it should return the string `'Try again!'`.

```php
<?php

guessNumber(42) // 'You win!'
guessNumber(61) // 'Try again!'
```
