<?php 
class L {
    const login = 'Login';
    const title_404 = '404';
    const title_dyn = 'Title: %s';
    const page_dyn = 'Page: %s - %s';
 
    public static function __callStatic($string, $args) {
       vsprintf(constant("self::" . $string), $args);
    }
}
 
echo L::login . "\n";                    // "Login"
echo L::title_404 . "\n";                // "404"
echo L::title_dyn('test') . "\n";        // (empty)
echo L::page_dyn('test', 'more') . "\n"; // (empty)
echo L::login() . "\n";                  // (empty)

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