使用php-spider，有没有一个标准的Xpath可以在大多数网站上发现URI？

require 'vendor/autoload.php';

use phpspider\core\phpspider;
use phpspider\core\requests;

// 设置爬虫的配置
$configs = array(
    'name' => 'URI Spider',
    'log_show' => false,
    'domains' => array(
        'example.com'
    ),
    'scan_urls' => array(
        'http://www.example.com'
    ),
    'content_url_regexes' => array(
        '/^http:\/\/www\.example\.com\/\w+$/'
    ),
    'fields' => array(
        array(
            'name' => 'uri',
            'selector' => 'a',
            'repeated' => true,
            'required' => true,
            'children' => array(
                array(
                    'name' => 'href',
                    'selector' => 'href',
                    'required' => true
                )
            )
        )
    )
);

// 定义回调函数，处理提取到的URI
function handle_uri($fieldname, $data, $page)
{
    foreach ($data as $item) {
        $uri = $item['href'];
        echo "URI: " . $uri . "\n";
    }
}

// 创建爬虫实例
$spider = new phpspider($configs);

// 注册回调函数
$spider->on_extract_page = 'handle_uri';

// 启动爬虫
$spider->start();