我的超级懒惰版本显示版权行，自动保持更新:

&copy; <?php 
$copyYear = 2008; 
$curYear = date('Y'); 
echo $copyYear . (($copyYear != $curYear) ? '-' . $curYear : '');
?> Me, Inc.

今年(2008年)，它会说:

©2008 Me, Inc

明年，它会说:

©2008-2009 Me, Inc

并且永远保持当前年份的更新。

或者(PHP 5.3.0+)一种使用匿名函数的紧凑方法，这样你就不会有变量泄露，也不会重复代码/常量:

© 
<?php call_user_func(function($y){$c=date('Y');echo $y.(($y!=$c)?'-'.$c:'');}, 2008); ?> 
Me, Inc.

print date('Y');

有关更多信息，请查看date()函数文档:https://secure.php.net/manual/en/function.date.php

<?php echo date("Y"); ?>

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.

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');

$year = date("Y", strtotime($yourDateVar));