PHP Class Constant

In this tutorial we will study how to declare a class constant in PHP. Sometimes we need to have constant values in our program which remains same through and through. We do not need to put a '$' sign before the constant to use or to declare it.

PHP Class Constants:

Sometimes we need to have constant values in our program which remains same through and through. We do not need to put a $ sign before the constant to use or to declare it.

The value of the constant should remain unchanged that means it must be a constant expression.

Example:

<?php

class A

{

const newValue="Constant value does not consist $ sign";

function display()

{

echo self::newValue."\n";

}

}

$a=new A();

$a->display();

?>

Output:

Constant value does not consist $ sign

Explanation:
In the above example there is a single class declaration named A. Outside of this class