PHP 7 Namespace consants

Namespace with class constants 

<?php

namespace Information;

class A  {

    const ROOT_URL = 'test';

}

echo \Information\A::ROOT_URL;

// Result: test

Namespace with constants 

namespace Information;

const ROOT_URL = 'test';

echo \Information\ROOT_URL;

// Result: test

https://stackoverflow.com/questions/18247726/php-define-constants-inside-namespace-clarification