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// 指定年の投稿数を取得 function get_year_archives_num( $year ) { global $wpdb; $cnt = $wpdb->get_var( "SELECT count(*) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' AND DATE_FORMAT(post_date, '%Y') = '".$year."';" ); return $cnt; } // 指定年月の投稿数を取得 function get_month_archives_num( $year, $month ) { global $wpdb; $cnt = $wpdb->get_var( "SELECT count(*) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' AND DATE_FORMAT(post_date, '%Y%m') = '".$year.str_pad($month, 2, 0, STR_PAD_LEFT)."';" ); return $cnt; } // 一番古い記事の年を取得 function get_oldest_year() { global $wpdb; $oldest_date = $wpdb->get_var( "SELECT post_date FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_date ASC LIMIT 1;" ); return idate('Y', strtotime($oldest_date) ); //投稿日の年だけ数値で取得 }