Class.php Constants

Class constants work in the same way as regular constants, except they are scoped within a class. Class constants are public, and accessible from all scopes; for example, the following script will output Hello World:

class foo {
const BAR = "Hello World";
}
echo foo::BAR;

IMPORTANT:Note that class constants suffer from the same limitations as regular constants— therefore, they can only contain scalar values.

Class constants have several advantages over traditional constants: since they are encapsulated in a class, they make for much cleaner code, and they are significantly faster than those declared with the define() construct.

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