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 PHP manuál : language.oop5.constants.html

Object Constants
PHP Manual
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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.

Example 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
?>
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