限定 WordPress 只搜索文章的标题

站长朋友们在使用WordPress建站的过程中会发现，WordPress 默认的搜索功能还是挺弱的，搜索出来的结果不符合人意，如果您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，下面我们就来介绍一下实现的方法。

切换到主题目录，打开 functions.php 文件，加入以下代码即可：

/**
	* Search SQL filter for matching against post title only.
	* @param   string      $search
	* @param   WP_Query    $wp_query
*/
function wp_search_by_title( $search, $wp_query ) {
    if ( ! empty( $search ) && ! empty( $wp_query->query_vars['search_terms'] ) ) {
        global $wpdb;

        $q = $wp_query->query_vars;
        $n = ! empty( $q['exact'] ) ? '' : '%';

        $search = array();

        foreach ( ( array ) $q['search_terms'] as $term )
            $search[] = $wpdb->prepare( "$wpdb->posts.post_title LIKE %s", $n . $wpdb->esc_like( $term ) . $n );

        if ( ! is_user_logged_in() )
            $search[] = "$wpdb->posts.post_password = ''";

        $search = ' AND ' . implode( ' AND ', $search );
    }

    return $search;
}

add_filter( 'posts_search', 'wp_search_by_title', 10, 2 );

/**

* Search SQL filter for matching against post title only.

* @param string $search

* @param WP_Query $wp_query

function wp_search_by_title( $search, $wp_query ) {

if ( ! empty( $search ) && ! empty( $wp_query->query_vars['search_terms'] ) ) {

global $wpdb;

$q = $wp_query->query_vars;

$n = ! empty( $q['exact'] ) ? '' : '%';

$search = array();

foreach ( ( array ) $q['search_terms'] as $term )

$search[] = $wpdb->prepare( "$wpdb->posts.post_title LIKE %s", $n . $wpdb->esc_like( $term ) . $n );

if ( ! is_user_logged_in() )

$search[] = "$wpdb->posts.post_password = ''";

$search = ' AND ' . implode( ' AND ', $search );

}

return $search;

}

add_filter( 'posts_search', 'wp_search_by_title', 10, 2 );

有需要的朋友可以使用上面的代码测试一下。