gistfile1.txt

% cat constants.const
namespace N {
    group G {
        A = 1;
        B = 2;
    }
}
% constc constants.const --php --javascript
% ls
G.php G.js
% cat G.php
<?php
namespace N;

final class G {
    const A = 1;
    const B = 2;

    private function __construct() { }
}
% cat G.js
(window.N || window.N = { }).G = {
    A: 1,
    B: 2
};