php 获取指定月份的天数

<?php
function getDaysInMonth($year, $month) {
    return cal_days_in_month(CAL_GREGORIAN, $month, $year);
}

$year = 2023;
$month = 2;
$days = getDaysInMonth($year, $month);

echo "The number of days in $month/$year is: $days";
?>

<?php
function getDaysInMonth($year, $month) {
    if ($month < 1 || $month > 12) {
        throw new InvalidArgumentException("Invalid month: $month");
    }
    return cal_days_in_month(CAL_GREGORIAN, $month, $year);
}

$year = 2023;
$month = 2;
try {
    $days = getDaysInMonth($year, $month);
    echo "The number of days in $month/$year is: $days";
} catch (InvalidArgumentException $e) {
    echo $e->getMessage();
}
?>