To find the number of elements in a PHP
"[sizeof] does not mean the same in
many other languages based on C"
I would use
count() if they are the same, as in my experience it is more common, and therefore will cause less developers reading your code to say "
sizeof(), what is that?" and having to consult the documentation.
I think it means
sizeof() does not work like it does in C (calculating the size of a datatype). It probably made this mention explicitly because PHP is written in C, and provides a lot of identically named wrappers for C functions (