WordPress默认的搜索功能，使用户搜索结果包括文章内容、文章标题与文章标签 这样搜索出来的结果不会很精确，如果你想让它搜索出来的结果更精确、相关，可以限定只搜索文章的标题。

将下面的代码添加到主题的 functions.php 文件即可实现：

//让WordPress只搜索文章的标题




function __search_by_title_only( $search, &$wp_query )

{

	global $wpdb;

	if ( empty( $search ) )

        return $search; // skip processing - no search term in query

    $q = $wp_query->query_vars;    

    $n = ! empty( $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 ( ! empty( $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 );