让 WordPress 只搜索文章的标题

WordPress 默认的搜索功能还真挺弱的，搜索出来的结果很不符合人意，如果你想让它检索出来的结果更加相关，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：

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/**
 * 让 WordPress 只搜索文章的标题
 * https://www.wpdaxue.com/search-by-title-only.html
 */
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 );

/**
* 让 WordPress 只搜索文章的标题
* https://www.wpdaxue.com/search-by-title-only.html
*/
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 );

参考资料：http://wordpress.stackexchange.com/questions/11822/