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

Yes, however there are cross platform differences.

I use # all the time for commenting in PHP, but I have noticed an adoption difference.

On windows keyboard the # key is easy to use. On mac keyboard # key mostly isn't present.

So for mac users, [Alt] + [3] or [⌥] + [3] is more difficult to type than //, so // has become a cross platform way of displaying code with comments.

This is my observation.