2. switch/case

http://www.php.net/manual/html/control-structures.switch.html)

"The case expression may be any expression that evaluates to a scalar
type, that is, integer or floating-point numbers and strings. Arrays or
objects are meaningless in that context. "

Strings is no scalar, but a composed type. Type CHAR in Pascal is a scalar, 
which compares to a  string of length one. 

It's even under discussion, whether a real number is a scalar type.
This ist, Because the always existing rounding errors with reals may 
prohibit one to give them the attribute scalar type.

You better could tell the readers only, that they cannot use Arrays and Objects 
in switch/case, but anything else and let off the other stuff.

Anyway, thanks for your efforts,
 oK