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 sektionen med navn Static Keyword members, constant values can not be accessed with a variable that is an instance of the object.

Eksempel 14-9. 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 */
?>