Wordpress动态获得版权年份方法

Wordpress动态获得版权年份的方法。

function copyrightDate() {
global $wpdb;
$copyright_dates = $wpdb->get_results(
SELECT
YEAR(min(post_date_gmt)) AS firstdate,
YEAR(max(post_date_gmt)) AS lastdate
FROM
$wpdb->posts
WHERE post_status = 'publish'
);
if($copyright_dates) {
$date = date('Y-m-d');
$date = explode('-',$date);
$copyright = Copyright © . $copyright_dates[0]->firstdate;
if($copyright_dates[0]->firstdate != $date[0]) {
$copyright .= '-' . $date[0];
}
echo $copyright;
}
}
add_filter('wp_footer','copyrightDate');