Algorithms: It looks like you haven't run the bubbleSort algo

[mbakirov]

There should be a return statement at this line https://github.com/ssspopovaa/homeworks/blob/e7285f9f1e9ea35e03d6c93ed9b982408cd5e3e4/Algorithms/bubbleSort.php#L21

[mbakirov]

It's always better to use immutable arguments. There is no need to pass all array within an reference