1102.php

<?php

function simpleMultiplication(int $number): int
{
    return ($number % 2) === 0 ? ($number * 8) : ($number * 9);
}

echo simpleMultiplication(2);

function odd_or_even(array $a): string
{
    // echo array_sum($a);
    count($a) === 0 ? array_push($a, 0) : '';
    return (array_sum($a) % 2 === 0) ? "even" : "odd";
}

echo odd_or_even([-1, -3, 5]);

function centuryFromYear1(int $year): int
{
    $str = (string) $year;
    // var_dump($str);
    // echo substr($str, 2, 4);
    // echo substr($str, 0, 2);
    return (substr($str, 2, 4) == "00") ? (int) substr($str, 0, 2) : (int) (substr($str, 0, 2) + 1);
}

echo centuryFromYear1(672615);

function centuryFromYear(int $year): int
{
    return ceil($year / 100);
}

echo centuryFromYear(1201);