Как преобразовать число в php массив

<?php

$number = 123;

$numberToString = (string)$number;
$lengthNumber = strlen($numberToString);

$result = [];
for ($i = 0; $i < $lengthNumber; $i++) {
    $result[] = (int)$numberToString[$i];
}

print_r($result); // => [1, 2, 3]

<?php
array_map(?callable $callback, array $array, array ...$arrays): array

<?php

$number = 123;

$numberToString = (string)$number;
$numberToArray = str_split($numberToString);

$result = array_map(function ($item) {
    return (int)$item;
}, $numberToArray);

print_r($result); // => [1, 2, 3]

<?php

$number = 123;
(array) $number;
print_r($number);
//=> [
//=>     123,
//=> ]