Static Function Variables and Concatenation in PHP

Question

Consider the following:

$var = \'foo\' . \'bar\'; # Not a member of a class, free-standing or in a function.

As soon as I mark $var

Answer 1

The manual states, in Variables scope:

Trying to assign values to these [static] variables which are the result of expressions will cause a parse error.

There is also mention of it in Static keyword:

Like any other PHP static variable, static properties may only be initialized using a literal or constant; expressions are not allowed.

Although it should be noted that a property, static or not, cannot be initialized using an expression neither.