On: I’m an Engineer, Not a Compiler

[icebraining]

But in PHP, there's technically no difference between a list and a set

Sure there is. In a set, you can't have repeated values. PHP arrays can. Of course, you can implement a set using a PHP array.

[lrobb → icebraining]

I'm well aware of the difference between a set and a list.

My point, which was apparently lost, is that the underlying implementation of these structures is the same in PHP.