WordPress替换头像服务器

function get_ssl_avatar($avatar) {
    $avatar = preg_replace('/.*\/avatar\/(.*)\?s=([\d]+)&.*/','<img src="https://secure.gravatar.com/avatar/$1?s=$2" class="avatar avatar-$2" height="$2" width="$2">',$avatar);
    return $avatar;
}
add_filter('get_avatar', 'get_ssl_avatar');