如果你的服务器支持短标签，或者你使用PHP 5.4，你可以使用:

<?=date("Y")?>

$dateYear = date('Y');
echo "Current Year: $dateYear";

本年:2022年

$dateYear = date('y');
echo $dateYear;

22

本节的最佳短代码:

<?= date("Y"); ?>

在date函数的第二个参数中可以得到更多的值 Strtotime返回参数传递的时间戳

// This work when you get time as string
echo date('Y', strtotime("now"));

// Get next years
echo date('Y', strtotime("+1 years"));

// 
echo strftime("%Y", strtotime("now"));

使用datetime类

echo (new DateTime)->format('Y');

<?php
$time_now=mktime(date('h')+5,date('i')+30,date('s'));
$dateTime = date('d_m_Y   h:i:s A',$time_now);

echo $dateTime;
?>

我显示版权的方式，它会自动更新

<p class="text-muted credit">Copyright &copy;
    <?php
        $copyYear = 2017; // Set your website start date
        $curYear = date('Y'); // Keeps the second year updated
        echo $copyYear . (($copyYear != $curYear) ? '-' . $curYear : '');
    ?> 
</p>    

它将输出结果为

copyright @ 2017   //if $copyYear is 2017 
copyright @ 2017-201x    //if $copyYear is not equal to Current Year.