FizzBuzz functional in PHP

FizzBuzz

<?php


$defaultCase = function ($x) {
    return $x."\n";   
};

$buzz = function ($x, callable $modify) {
    if (($x%5) == 0) {
        return "Buzz\n";
    }

    return $modify($x);
};

$fizz = function ($x, callable $modify) {
    if (($x%3) == 0) {
        return "Fizz\n";
    }

    return $modify($x);
};

$fizzbuzz = function ($x, callable $modify) {
    if (($x%3) == 0) {
        if (($x%5) == 0) {
            return "FizzBuzz\n";
        }
    }

    return $modify($x);
};

$callable = function ($x) use ($fizzbuzz, $fizz, $buzz, $defaultCase) {
    $buzzCallable = function ($x) use ($buzz, $defaultCase) {
        return $buzz($x, $defaultCase);
    };

    $fizzCallable = function ($x) use ($fizz, $buzzCallable) {
        return $fizz($x, $buzzCallable);
    };

    return $fizzbuzz($x, $fizzCallable);
};


for($x=1 ; $x<40 ; $x++) {
    echo $callable($x);
}