Manuale PHP
Indietro	Capitolo 19. Classes and Objects (PHP 5)	Avanti

Object Constants

It is possible to define constant values on a per-class basis remaining the same and unchangeable. Constants differ from normal variables in that you don't use the $ symbol to declare or use them. Like static members, constant values can not be accessed from an instance of the object.

Esempio 19-15. Defining and using a constant


<?php
class MyClass
{
    const constant = 'constant value';

    function showConstant() {
        echo  self::constant . "\n";
    }
}

echo MyClass::constant . "\n";

$class = new MyClass();
$class->showConstant();
// echo $class::constant;  is not allowed
?>

Indietro	Partenza	Avanti
Static Keyword	Risali	Object Abstraction