WordPress之分页导航

if ( !function_exists('pagenavi') ) {
    function pagenavi( $p = 2 ) { // 取当前页前后各 2 页
        if ( is_singular() ) return; // 文章与插页不用
        global $wp_query, $paged;
        $max_page = $wp_query->max_num_pages;
        if ( $max_page == 1 ) return; // 只有一页不用
        if ( empty( $paged ) ) $paged = 1;
        echo '<div class="pagenavi"><span class="pages">Page <b>' . $paged . '</b> of <b>' . $max_page . '</b></span> '; // 显示页数
	    if ( $paged > 1 ) p_link( $paged - 1, '上一页', '‹' );/* 如果当前页大于1就显示上一页链接 */
        if ( $paged > $p + 1 ) p_link( 1, '首页' );
		if ( $paged > $p + 2 ) echo '<span class="page-more">...</span>';

        for( $i = $paged - $p; $i <= $paged + $p; $i++ ) { // 中间页
            if ( $i > 0 && $i <= $max_page ) $i == $paged ? print "<span class='page-numbers current'>{$i}</span> " : p_link( $i );
        }
		if ( $paged < $max_page - $p - 1 ) echo '<span class="page-more">...</span>';
	    if ( $paged < $max_page - $p ) p_link( $max_page, '最后页' );
		if ( $paged < $max_page ) p_link( $paged + 1,'下一页', '›' );/* 如果当前页不是最后一页显示下一页链接 */
		echo '</div>';
    }
   function p_link( $i, $title = '', $linktype = '' ) {
        if ( $title == '' ) $title = "第 {$i} 页";
        if ( $linktype == '' ) { $linktext = $i; } else { $linktext = $linktype; }
        echo "<a class='page-numbers' href='", esc_html( get_pagenum_link( $i ) ), "' title='{$title}'>{$linktext}</a> ";
    }
}

<?php if (function_exists('pagenavi')) { pagenavi();} ?>

.pagenavi {
    display: table;
    margin: 50px auto;
}

.pages, .page-more, .page-numbers {
    height: 40px;
    width: 40px;
    font-size: 18px;
    color: #666;
    display: block;
    float: left;
    position: relative;
    text-align: center;
    margin-right: 5px;
    margin-top: 15px;
}

.pages {
    width: auto;
    font-size: 14px;
    line-height: 40px;
    margin-right: 15px;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.page-numbers {
    line-height: 40px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
    border: #666 1px solid;
    border-radius: 10px;
}

.page-numbers:hover {
    color: #fff;
    background: rgba(0, 123, 255, 0.87);
    border: 6px double #fff;
    margin-top: 10px;
    box-shadow: none;
}

.pagenavi .current, .pagenavi .current:hover {
    color: #fff;
    background: #007AFF;
    border: 6px double #fff;
    margin-top: 10px;
    box-shadow: none;
}

.page-numbers a:hover, span.current {
    text-decoration: none;
}

function custom_posts_per_page($query) {
    if (is_home()) {
        $query->set('posts_per_page', 8);
    }
    if (is_search()) {
        $query->set('posts_per_page', -1);
    }
    if (is_archive()) {
        $query->set('posts_per_page', 25);
    } //endif
} //function

//this adds the function above to the 'pre_get_posts' action     
add_action('pre_get_posts', 'custom_posts_per_page');