这个给出了当地时间:

$year = date('Y'); // 2008

这个UTC:

$year = gmdate('Y'); // 2008

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

本年:2022年

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

22

echo date('Y')给你当前年份，这将自动更新，因为date()给我们当前日期。

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.

全年使用:

 <?php 
    echo $curr_year = date('Y'); // it will display full year ex. 2017
?>

或者只得到两位年份，就像这样:

 <?php 
    echo $curr_year = date('y'); // it will display short 2 digit year ex. 17
?>

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