<!DOCTYPE html>
<html>
<body>
<?php
$d=cal_days_in_month(CAL_GREGORIAN,2,1965);
echo "There was $d days in February 1965.<br>";
$d=cal_days_in_month(CAL_GREGORIAN,2,2004);
echo "There was $d days in February 2004.";
?>
</body>
</html>