Please explain: what makes this choice "correct?" Is it because it's your personal preference?

Different languages have different features. I've been coding PHP for years, and I've never encountered this feature before. I suspect that's true because I don't usually treat strings like integers. However, now that I know it's possible, I might actually use it to generate random strings or do something useful. I don't see it as something that is incorrect, I see it as how the language is implemented.