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WordPressのアーカイブで月送りナビをつける

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「前の月へ」「次の月へ」みたいなやつ。MTだと簡単に出来るらしいんだけど、WPだと割りと面倒くさい。

コアファイルからカレンダー関数拾ってきてカレンダー消してナビだけにして使った。これ優秀で投稿がない月はちゃんと飛ばしてくれる。 吐き出すhtmlは最後の方の該当箇所いじればある程度好きにできる。

function get_monthlyNav($initial = true, $echo = true) {
    global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;

    $cache = array();
    $key = md5( $m . $monthnum . $year );
    if ( $cache = wp_cache_get( 'get_calendar', 'calendar' ) ) {
        if ( is_array($cache) && isset( $cache[ $key ] ) ) {
            if ( $echo ) {
                echo apply_filters( 'get_calendar',  $cache[$key] );
                return;
            } else {
                return apply_filters( 'get_calendar',  $cache[$key] );
            }
        }
    }

    if ( !is_array($cache) )
        $cache = array();

    // Quick check. If we have no posts at all, abort!
    if ( !$posts ) {
        $gotsome = $wpdb->get_var("SELECT 1 as test FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1");
        if ( !$gotsome ) {
            $cache[ $key ] = '';
            wp_cache_set( 'get_calendar', $cache, 'calendar' );
            return;
        }
    }

    if ( isset($_GET['w']) )
        $w = ''.intval($_GET['w']);

    // week_begins = 0 stands for Sunday
    $week_begins = intval(get_option('start_of_week'));

    // Let's figure out when we are
    if ( !empty($monthnum) && !empty($year) ) {
        $thismonth = ''.zeroise(intval($monthnum), 2);
        $thisyear = ''.intval($year);
    } elseif ( !empty($w) ) {
        // We need to get the month from MySQL
        $thisyear = ''.intval(substr($m, 0, 4));
        $d = (($w - 1) * 7) + 6; //it seems MySQL's weeks disagree with PHP's
        $thismonth = $wpdb->get_var("SELECT DATE_FORMAT((DATE_ADD('${thisyear}0101', INTERVAL $d DAY) ), '%m')");
    } elseif ( !empty($m) ) {
        $thisyear = ''.intval(substr($m, 0, 4));
        if ( strlen($m) < 6 )
                $thismonth = '01';
        else
                $thismonth = ''.zeroise(intval(substr($m, 4, 2)), 2);
    } else {
        $thisyear = gmdate('Y', current_time('timestamp'));
        $thismonth = gmdate('m', current_time('timestamp'));
    }

    $unixmonth = mktime(0, 0 , 0, $thismonth, 1, $thisyear);

    // Get the next and previous month and year with at least one post
    $previous = $wpdb->get_row("SELECT DISTINCT MONTH(post_date) AS month, YEAR(post_date) AS year
        FROM $wpdb->posts
        WHERE post_date < '$thisyear-$thismonth-01'
        AND post_type = 'post' AND post_status = 'publish'
            ORDER BY post_date DESC
            LIMIT 1");
    $next = $wpdb->get_row("SELECT  DISTINCT MONTH(post_date) AS month, YEAR(post_date) AS year
        FROM $wpdb->posts
        WHERE post_date >   '$thisyear-$thismonth-01'
        AND MONTH( post_date ) != MONTH( '$thisyear-$thismonth-01' )
        AND post_type = 'post' AND post_status = 'publish'
            ORDER   BY post_date ASC
            LIMIT 1");

    if ( $previous ) {
        $calendar_output .= "\n\t\t".'<a href="' . get_month_link($previous->year, $previous->month) . '" title="' . sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($previous->month), date('Y', mktime(0, 0 , 0, $previous->month, 1, $previous->year))) . '">前の月へ</a>';
    }

    if ( $next ) {
        $calendar_output .= "\n\t\t".'<a href="'. get_month_link($next->year, $next->month) . '" title="' . esc_attr( sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($next->month), date('Y', mktime(0, 0 , 0, $next->month, 1, $next->year))) ) . '">次の月へ</a>';
    };

    if ( $echo )
        echo apply_filters( 'get_calendar',  $calendar_output );
    else
        return apply_filters( 'get_calendar',  $calendar_output );
}

以上をfunctions.phpとか適当なところに書いて、吐き出したいところに

<?php get_monthlyNav(); ?>