ตรวจวันที่ด้วย PHP

$date = date_create('2011-02-31');
if (!$date)
{
    $e = date_get_last_errors();
    foreach ($e['errors'] as $error) {
        echo "$error\n";
    }
}
else
{
    echo date_format($date, 'Y-m-d');
}
echo'<br />';
try {
    $date = new DateTime('2011-02-31');
} catch (Exception $e) {
    echo $e->getMessage();
    exit(1);
}
echo $date->format('Y-m-d');

if(checkdate(02, 31, 2011))
{
    echo '<br />ถูกต้องคราบ';
}
else
{
    echo '<br />ลองใหม่น่า';
}