Please add @throws phpdoc comments to helper functions

[arthurshafikov]

It's not always clear that a helper function can throw an exception, it has to have a phpdoc @throws comment.

For example lessThan function has an indicator that it throws an exception, I can see from that that I have to deal with this Exception by myself.

Also maybe you would like to add is_valid_money_string() function-helper or money_validate() to validate the string before parsing? I want to have a way of avoiding try/catch structures.

[PostScripton]

Hi, @arthurshafikov! Thank you for your the first issue on this repo.

I'll definitely add those exceptions to PHPDocs.
Thank you for reporting that 👍🏻

Speaking of additional helper method, I'll think of adding it, this seems useful 😉

[PostScripton]

@arthurshafikov, I've got updates on your issue.

That's been fixed here: #150
And released in this version: v4.1.1

I'll open a new issue for the new helper method that you've mentioned