WordPress 底部添加动态版权日期

function zm_copyright() {

	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'");

	$output = '';

	if( $copyright_dates ) {

		$copyright = "© " . $copyright_dates[0]->firstdate;

		if( $copyright_dates[0]->firstdate != $copyright_dates[0]->lastdate ) {

			$copyright .= '-' . $copyright_dates[0]->lastdate;

		}

		$output = $copyright;

	}

	return $output;

}

<?php echo zm_copyright(); ?>