这样就算会了PHP么？-8

<?php
    date_default_timezone_set("Asia/Shanghai");
    echo "mktime函数返回的时间戳： ".mktime()."<p>";
    echo "当前的日期为： ".date("Y-m-d", mktime())."<p>";
    echo "当前的时间为： ".date("H:i:s", mktime())."<p>";
    $nextWeek = time() + (7 * 24 * 60 * 60);
    echo ‘Now: ‘.date(‘Y-m-d‘)."<p>";
    echo ‘Next Week: ‘.date(‘Y-m-d‘,$nextWeek)."<p>";
    echo "DATE_ATOM = ".date(DATE_ATOM);
    echo "<p>DATE_COOKIE = ".date(DATE_COOKIE)."<p>";
    $arr = getdate();
    echo $arr[year]."-".$arr[mon]."-".$arr[mday].""."<p>";
    $year = 2008;
    $month = 2;
    $day1 = 29;
    $day2 = 30;
    var_dump(checkdate($month, $day1, $year));
    echo "<br>";
    var_dump(checkdate($month, $day2, $year));
    echo "<br>";
    echo date("l Y-m-d H:i:s T");
    echo "<br>";
    setlocale(LC_ALL, "chs");
    echo "中文简体格式:".strftime("今天是%A");
    echo "<br>";
    echo strtotime("now"), "\n";
    echo "输出时间： ".date("Y-m-d H:i:s", strtotime("now")), "<br>";
    
?>