Constants
A constant can't be changed once set.
/**
* Constants can be defined using the const keyword ...
* or by using the define()
*
* Can't be changed once set.
* Can be accessed for any scope within a script.
*/
error_reporting(E_ALL);
define('A', '1');
// const A = 1; // Warning: Constant A already defined
const B = 2;
const C = array(3);
{
echo A; # 1
echo B; # 2
echo C[0]; # 3
}
Class
The default visibility of class constants is public.
/**
* Class constants are allocated once per class, ...
* and not for each class instance.
*/
class MyClass {
const A = 1;
private const B = 2;
public function __construct() {}
}
echo MyClass::A; // 1
Last update: 213 days ago
