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：
//提高搜索结果相关性
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";
} |
//提高搜索结果相关性
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";
}
上面的排序方法很简单：当文章标题含有关键字的时候给予权重值 2，内容里含有关键字的时候给予权重值 1，把两个权重值相加以后降序排列。然后才用文章修改时间和ID降序作为候补排序方法。这样一来，搜索出来的结果就更加准确了。
来源：
https://www.wpdaxue.com/improve-wordpress-search-results.html
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