constant values example in oop

<?php

/*constant values are important when you want to make value remain unchanged all over the script..
Constant properties can contain only primitive values. You cannot assign an object to a constant.
Like global constants, class constants
cannot be changed once they are set. A constant property is declared with the const keyword. Constants are not prefixed with a dollar sign like regular properties.

constant values are prefixed with const keyword ..

*/

class ap
{
const FLAG = 0;

public function change()
{
$this->FLAG = 2;
}
public function show()
{
echo $this->FLAG;
}
}

$object = new ap();

$object->change();
$object->show();
?>

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