Difference between passing array, fixed-sized array and base address of array as a function parameter

Question

I am confused about which syntax to use if I want to pass an array of known or unknown size as a function parameter.

Suppose I have these variants for the purpose:

Answer 1

Note that in C++, if the length of the array is known at compile time (for example if you passed a string literal), you can actually get its size:

template
void func(const char(&str)[N])
{
    // Whatever...
}

int main()
{
    func("test"); // Works, N is 5
}