<form>
<input type="text" name="??" placeholder="??? ?????">
<input type="submit" name="calculate">
</form>
<?php
$year=$_GET['year'];
if($year%4==0&&$year%100==0||$year%400 = =0)
{
echo "??? ?????";
}
else{
echo "??? ?????";
}
?>
4
0
0
![[? ?????] Node.js ?? ??](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
