Can I use string concatenation to define a class CONST in PHP?

Question

I know that you can create global constants in terms of each other using string concatenation:

define(\'FOO\', \'foo\');
define(\'BAR\', FOO.\'bar\');  
echo         


        

Answer 1

For class constants, you can't assign anything other than a constant expression. Quoting the PHP manual:

"The value must be a constant expression, not (for example) a variable, a property, a result of a mathematical operation, or a function call. "