PHP 获取当天星期几 (英文缩写)

<?php
date_default_timezone_set('Asia/Shanghai');
$dayOfWeek = date('D');
switch ($dayOfWeek) {
    case 'Mon':
        $weekday = 'Monday';
        break;
    case 'Tue':
        $weekday = 'Tuesday';
        break;
    case 'Wed':
        $weekday = 'Wednesday';
        break;
    case 'Thu':
        $weekday = 'Thursday';
        break;
    case 'Fri':
        $weekday = 'Friday';
        break;
    case 'Sat':
        $weekday = 'Saturday';
        break;
    case 'Sun':
        $weekday = 'Sunday';
        break;
}
echo 'Today is ' . $weekday . '.';
?>