wordpress分页显示错误，是不是分页代码有误？

Question

现在不管点第几页，.current的效果都只在第一页上。大神们帮我看看，是不是分页代码有错误。

function pagination($query_string)
{
    global $posts_per_page;
    global $paged;
    $my_query = new WP_Query($query_string . "&posts_per_page=-1");
    $total_posts = $my_query->post_count;

    if ($paged) {
        $paged = 1;
    }

    $prev = $paged - 1;
    $next = $paged + 1;
    $range = 5;
    $showitems = ($range * 2) + 1;
    $pages = ceil($total_posts / $posts_per_page);

    if (1 != $pages) {
        echo "<div class='pagination'>";
        echo (2 < $paged) && ($pages < ($paged + $range + 1)) && ($showitems < $pages) ? "<a href='" . get_pagenum_link(1) . "' class='fir_las'>最前</a>" : "";
        echo (1 < $paged) && ($showitems < $pages) ? "<a href='" . get_pagenum_link($prev) . "' class='page_previous'>« 上一页</a>" : "";

        for ($i = 1; $i <= $pages; $i++) {
            if ((1 != $pages) && (!(($paged + $range + 1) <= $i) || ($i <= $paged - $range - 1) || ($pages <= $showitems))) {
                echo $paged == $i ? "<span class='current'>" . $i . "</span>" : "<a href='" . get_pagenum_link($i) . "' class='inactive' >" . $i . "</a>";
            }
        }

        echo ($paged < $pages) && ($showitems < $pages) ? "<a href='" . get_pagenum_link($next) . "' class='page_next'>下一页 »</a>" : "";
        echo ($paged < ($pages - 1)) && ((($paged + $range) - 1) < $pages) && ($showitems < $pages) ? "<a href='" . get_pagenum_link($pages) . "' class='fir_las'>最后</a>" : "";
        echo "</div>\n";
    }
}