一、wordpress 禁止PC首页访问 不影响蜘蛛抓取的方法

function block_homepage_for_pc() {
    if ( ! is_admin() && ! is_feed() ) {
        $user_agent = $_SERVER['HTTP_USER_AGENT'];
        if ( strpos( $user_agent, 'Googlebot' ) === false && strpos( $user_agent, 'Bingbot' ) === false && strpos( $user_agent, 'Slurp' ) === false && strpos( $user_agent, 'DuckDuckBot' ) === false ) {
            global $wp_query;
            $wp_query->set_404();
            status_header( 404 );
            get_template_part( 404 );
            exit();
        }
    }
}
add_action( 'template_redirect', 'block_homepage_for_pc' );

二、nginx 屏蔽网站首页访问 允许蜘蛛访问的方法

location = / {
    if ($http_user_agent !~* (spider|bot|googlebot|bingbot|yandex|msnbot|slurp)) {
        return 403;
    }
    # other rules
}

三、NGINX 禁止PC访问 不影响蜘蛛抓取的方法

if ($http_user_agent !~* (android|iphone|ipod|ipad|windows\s*phone|blackberry|symbian|bot|crawl|spider)) {
    return 403; # 拒绝所有 PC 访问请求
    }

四、只禁止访问首页

set $PCindex "/path/to/pc/index.html";
location = / {
    if ($http_user_agent !~* "bot|crawler|spider") {
        return 403;
    }
    try_files $PCindex =404;
}