给你，这是我很快做出来的东西，看起来效果很好：

<?php
/*
Plugin Name: admin-filter-by-week
Plugin URI: http://en.bainternet.info
Description: answer to Filtering posts on Post Administration Page by Week Number instead of by Month
http://wordpress.stackexchange.com/questions/19186/filtering-posts-on-post-administration-page-by-week-number-instead-of-by-month
Version: 1.0
Author: Bainternet
Author URI: http://en.bainternet.info
*/

add_filter( \'parse_query\', \'week_admin_posts_filter\' );
add_action( \'restrict_manage_posts\', \'ba_admin_posts_filter_restrict_manage_posts\' );

function week_admin_posts_filter( $query )
{
    global $pagenow;
    if ( is_admin() && $pagenow==\'edit.php\' && isset($_GET[\'weekly_archive-dropdown\']) && $_GET[\'weekly_archive-dropdown\'] != \'\') {
        $link =  $_GET[\'weekly_archive-dropdown\'];  
        //http://en.bainternet.info/?m=2011&w=22
        $pos = strpos($link, \'?m=\');
        if ($pos !== false) {
            $m = substr($link, $pos + 3);
            $wpos = strpos($m, \'&w=\');
            $w = substr($m, $wpos + 3);
            $m = substr($m, 0, $wpos + 3);
            $query->query_vars[\'year\'] = $m;
            $query->query_vars[\'w\'] = $w;
            $query->query_vars[\'post_status\'] = array(\'publish\',\'pending\',\'draft\',\'future\',\'private\');
        }
    }
}

function hack_weekly_archives($w){
    $types = "IN(\'publish\',\'pending\',\'draft\',\'future\',\'private\')";
    $w = str_replace("= \'publish\'",$types,$w);
    return $w;
}


function ba_admin_posts_filter_restrict_manage_posts()
{
    add_filter(\'getarchives_where\',\'hack_weekly_archives\');
    ?>
    <select name="weekly_archive-dropdown">
    <option value=""><?php echo esc_attr( __( \'Select Week\' ) ); ?></option> 
    <?php wp_get_archives( \'type=weekly&format=option&show_post_count=1\' ); ?>
    </select>
    <?php
    remove_filter(\'getarchives_where\',\'hack_weekly_archives\');
}