1.增加WordPress搜索的关联性
WordPress本身的搜索结果是按照发布时间排序的,这样的搜索结果的相关性并不强,应该让搜索结果按照内容相关性排序,而不是按照时间或者 ID,所以我们可以在当前主题的 functions.php 添加如下代码来增强 WordPress 搜索的相关性:
if(is_search()){ add_filter(‘posts_orderby_request’, ‘search_orderby_filter’); } function search_orderby_filter($orderby = ”){ global $wpdb; $keyword = $wpdb->prepare($_REQUEST[‘s’]); return "((CASE WHEN {$wpdb->posts}.post_title LIKE ‘%{$keyword}%’ THEN 2 ELSE 0 END) + (CASE WHEN {$wpdb->posts}.post_content LIKE ‘%{$keyword}%’ THEN 1 ELSE 0 END)) DESC, {$wpdb->posts}.post_modified DESC, {$wpdb->posts}.ID ASC"; } |
只搜索文章
只搜索文章的标题,将下面的代码添加到主题的 functions.php 文件即可:
/** * 让 WordPress 只搜索文章的标题 */ function __search_by_title_only( $search, &$wp_query ) { global $wpdb; if ( emptyempty( $search ) ) return $search; // skip processing – no search term in query $q = $wp_query->query_vars; $n = ! emptyempty( $q[‘exact’] ) ? ” : ‘%'; $search = $searchand = ”; foreach ( (array) $q[‘search_terms’] as $term ) { $term = esc_sql( like_escape( $term ) ); $search .= "{$searchand}($wpdb->posts.post_title LIKE ‘{$n}{$term}{$n}’)"; $searchand = ‘ AND ‘; } if ( ! emptyempty( $search ) ) { $search = " AND ({$search}) "; if ( ! is_user_logged_in() ) $search .= " AND ($wpdb->posts.post_password = ”) "; } return $search; } add_filter( ‘posts_search’, ‘__search_by_title_only’, 500, 2 ); |
选择分类搜索文章:
将默认的searchform.php修改为以下代码:
<form id=”searchform” name=”searchform” method=”get” action=”<?php bloginfo(‘home’); ?>/” > <ul> <li> <p> <?php $select = wp_dropdown_categories(‘class=search_select&show_option_all=全站搜索& amp;orderby=name&hierarchical=0&selected=-1&depth=1′);?> </p> </li> <li> <input type=”text” name=”s” id=”s” maxlength=”34″ value=””/> </li> <li> <input type=”image” value=”” src=”<?php bloginfo(‘template_url’); ?>/img/search.gif”/> </li> </ul> </form> |