Can I use a hash sign (#) for commenting in PHP?

Question

I have never, ever, seen a PHP file using hashes (#) for commenting. But today I realized that I actually can! I\'m assuming there\'s a reason why everybody uses

Answer 1

There's no official PSR for that.

However, in all PSR example code, they use // for inline comments.

There's an PSR-2 extension proposal that aims to standardize it, but it's not official: https://github.com/php-fig-rectified/fig-rectified-standards/blob/master/PSR-2-R-coding-style-guide-additions.md#commenting-code

// is more commonly used in the PHP culture, but it's fine to use # too. I personally like it, for being shorter and saving bytes. It's personal taste and biased, there's no right answer for it, until, of course, it becomes a standard, which is something we should try to follow as much as possible.