$-less PHP

fizzbuzz-without-arg.php

<?php

const X = 100;
const FB = ['FizzBuzz', null, null, 'Fizz', null, 'Buzz', 'Fizz',
            null, null, 'Fizz', 'Buzz', null, 'Fizz', null, null];

call_user_func(new class {
    function __invoke()
    {
        if (X-count(debug_backtrace())-1) call_user_func(__METHOD__);
        echo FB[(X-count(debug_backtrace())) % 15] ?? X-count(debug_backtrace()), PHP_EOL;
    }
});

fizzbuzz.php

<?php

const FB = ['FizzBuzz', null, null, 'Fizz', null, 'Buzz', 'Fizz', null, null, 'Fizz', 'Buzz', null, 'Fizz', null, null];

call_user_func(new class {
    function __invoke()
    {
        if (func_get_arg(0) -1 ) call_user_func(__METHOD__, func_get_arg(0) - 1);
        echo FB[func_get_arg(0) % 15] ?? func_get_arg(0), PHP_EOL;
    }
}, 100);