PHPのdate関数を使って日付を取得する方法【初心者にもわかりやすく解説】

<?php echo date('Y/m/d'); ?>
<?php echo "<br>"; ?>
<?php echo date('Y年m月d日'); ?>

    <?php echo date('y/m/d'); ?>
    <?php echo "<br>";?>
    <?php echo date('Y/M/d'); ?>

    <?php
        $day_of_the_week = ['日','月','火','水','木','金','土'];
        $date_num = date('w');
        $today = $day_of_the_week[$date_num];
        echo '今日は'.$today.'曜日です。';
    ?>

     <?php
        $year = date('Y');
        $month = date('m');
        $day = date('d');

        $last_month = $month - 1;
        $next_year = $year + 1;

        $today = $year ."年". $month ."月". $day ."日";
        echo "今日は" . $today . "です。<br>";
        echo "先月は" . $last_month . "月です。<br>";
        echo "来年は" . $next_year . "年です。";
     ?>