让WordPress每篇文章的发布时间至少间隔1小时

//设定每篇文章的发布间隔 
//From https://www.wpdaxue.com/post-publication-spacing-in-minutes.html
function force_time_between_posts($data, $postarr) {
	global $wpdb;
	if (empty($postarr['ID'])) return $data;

	$latest = $wpdb->get_var("
		SELECT post_date
		FROM {$wpdb->posts} 
		WHERE post_status IN('future','publish') 
		AND post_type = 'post' 
		AND ID != {$postarr['ID']}
		ORDER BY post_date DESC
		LIMIT 1");
	$distance = 60; // 时间间隔（分钟）
	$latest = strtotime($latest);
	$current = strtotime($data['post_date']);

	if ($latest < $current) {
		$diff = $current - $latest;
	} else { 
		$diff = 0;
	}

	if ($diff >= 0 && $diff < ($distance * 60)) {
		$new_date = $latest + ($distance * 60);
		$date = date('Y-m-d H:i:s',$new_date);
		$date_gmt = get_gmt_from_date($date);
		$data['post_date'] = $date;
		$data['post_date_gmt'] = $date_gmt;
		$data['post_status'] = 'future';
	}
	return $data;
}
add_action('wp_insert_post_data','force_time_between_posts',1,2);