免插件实现日志分页导航

// 分页导航
function par_pagenavi( $range = 9 ) {
    global $paged, $wp_query;

    if ( ! $max_page ) {
        $max_page = $wp_query->max_num_pages;
    }

    if ( $max_page > 1 ) {
        if ( ! $paged ) {
            $paged = 1;
        }

        if ( $paged != 1 ) {
            echo "<a href='" . get_pagenum_link( 1 ) . "' class='extend' title='跳转到首页'> 返回首页 </a>";
        }

        previous_posts_link( ' 上一页 ' );

        if ( $max_page > $range ) {
            if ( $paged < $range ) {
                // 当前页靠近开头：显示第 1 ~ $range+1 页
                for ( $i = 1; $i <= $range + 1; $i++ ) {
                    echo "<a href='" . get_pagenum_link( $i ) . "'";
                    if ( $i == $paged ) {
                        echo " class='current'";
                    }
                    echo ">$i</a>";
                }
            } elseif ( $paged >= $max_page - ceil( $range / 2 ) ) {
                // 当前页靠近结尾：显示最后 $range+1 页
                for ( $i = $max_page - $range; $i <= $max_page; $i++ ) {
                    echo "<a href='" . get_pagenum_link( $i ) . "'";
                    if ( $i == $paged ) {
                        echo " class='current'";
                    }
                    echo ">$i</a>";
                }
            } elseif ( $paged >= $range && $paged < $max_page - ceil( $range / 2 ) ) {
                // 当前页在中间：以当前页为中心前后各取 $range/2 页
                for ( $i = $paged - ceil( $range / 2 ); $i <= $paged + ceil( $range / 2 ); $i++ ) {
                    echo "<a href='" . get_pagenum_link( $i ) . "'";
                    if ( $i == $paged ) {
                        echo " class='current'";
                    }
                    echo ">$i</a>";
                }
            }
        } else {
            // 总页数不超过 $range：全部显示
            for ( $i = 1; $i <= $max_page; $i++ ) {
                echo "<a href='" . get_pagenum_link( $i ) . "'";
                if ( $i == $paged ) {
                    echo " class='current'";
                }
                echo ">$i</a>";
            }
        }

        next_posts_link( ' 下一页 ' );

        if ( $paged != $max_page ) {
            echo "<a href='" . get_pagenum_link( $max_page ) . "' class='extend' title='跳转到最后一页'> 最后一页 </a>";
        }
    }
}

#pagenavi {
    border-top: 1px solid #CCC;
    width: 100%;
    height: 36px;
    line-height: 36px;
    text-align: center;
    overflow: hidden;
    padding-top: 1em;
}

#pagenavi a {
    padding: 3px 8px;
    margin: 2px;
    text-decoration: none;
    border: 1px solid #BFBFBF;
}

#pagenavi a:hover,
#pagenavi a.current {
    background: #F7F7F7;
    border: 1px solid #356aa0;
    color: #356aa0;
    font-weight: bolder;
}