月別アーカイブをコンパクトに表示。
monthchunks plugin for WordPress　http://justinsomnia.org/2005/04/monthchunks-howto/
左列真ん中くらいに　
Instructions
　　Download and unzip monthchunks-2.1.zip (v2.1)
ダウンロード後　/wp-content/plugins/　へアップ、有効。
うちのテーマでは　<?php wp_get_archives(‘type=monthly’); ?>　は使ってない。

/wp-includes/widgets.php
801行目を変更。

/**
 * Display archives widget.
 *
 * @since 2.2.0
 *
 * @param array $args Widget arguments.
 */
function wp_widget_archives($args) {
	extract($args);
	$options = get_option('widget_archives');
	$c = $options['count'] ? '1' : '0';
	$d = $options['dropdown'] ? '1' : '0';
	$title = empty($options['title']) ? __('Archives') : apply_filters('widget_title', $options['title']);
　
	echo $before_widget;
	echo $before_title . $title . $after_title;
　
	if($d) {
?>
		<select name="archive-dropdown" onchange='document.location.href=this.options[this.selectedIndex].value;'> <option value=""><?php echo attribute_escape(__('Select Month')); ?></option> <?php wp_get_archives("type=monthly&format=option&show_post_count=$c"); ?> </select>
<?php
	} else {
?>
		<ul>
		<?php monthchunks("descending"); ?>  //変更、オプションのdescendingで新年度が上に表示
		</ul>
<?php
	}
　
	echo $after_widget;
}

一桁月の前にゼロをつける。
参考先　「月別アーカイブをコンパクトにするプラグイン「monthchunks」」
http://www.wp-guide.net/wpplugin/wphyouji/150.html
/wp-content/plugins/monthchunks-2.1/monthchunks.php
76、97行目変更

function monthchunks($year_order = "ascending", $month_format = "numeric")
{
    // get access to wordpress' database object
    global $wpdb;
    $current_month = "";
    $current_year  = "";

    // get current year/month if current page is monthly archive
    if (is_month())
    {
        $current_month = get_the_time('m');  //変更
        $current_year  = get_the_time('Y');
    }
　
    // set SQL order by sort order
    if ($year_order == "descending")
    {
        $year_order = "DESC";
    }
    else
    {
        $year_order = "ASC";
    }
　
    // set format for month display
    if ($month_format == "alpha")
    {
        $month_format = "LEFT(DATE_FORMAT(post_date, '%M'), 1)";
    }
    else
    {
        $month_format = "DATE_FORMAT(post_date, '%m')";  //変更
    }

最終は
参考ページ
monthchunksの表記を日本語にしてみた　http://blog.open-arms.biz/200805/06422.php

        // start the list item displaying the year
        $year_= $year ."年";
        print "<li><strong>$year_</strong><br />\n";

        // loop through each month, creating a link
        // followed by a single space
        $month_count = count($months);
        $i = 0;
        foreach($months as $month)
        {
            // display the current month in bold without a link
            if ($year == $current_year && $month->post_month == $current_month)
            {
                $month_ = $month->display_month . "月";
                print "<strong title='$month->post_month_name $year'>$month_</strong>";
            }
            else
            {
                $month_ = $month->display_month . "月";
                print "<a href='" . get_month_link($year, $month->post_month) . "' title='$month->post_month_name $year'>" . $month_ . "</a>";
            }

            if ($i < $month_count-1)
            {
                print " \n";
            }
            $i++;
        }

        //end the year list item
        print "</li>\n\n";
    }
}

?>

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