站点地图这个东西,目的是为了对搜索引擎友好。搜索引擎每天来爬你的网站,如果能给它提供一份实时更新的站点地图,自然会让搜索引擎在爬取网站的时候更加有效率。
这里用php实现了一个自动化的站点地图生成器,可以在爬虫访问站点地图的时候动态的创建页面,来提供一份实时更新的sitemap.xml。
具体的实现,首先你需要让apache服务器支持将xml文件作为php来解析,这样sitemap.xml中的php语句得以执行。
可在站点根目录下的.htaccess文件的 和之间加入这一句:
AddType application/x-httpd-php .xml
至于php部分,其实就是先获取网站首页所有的url,再将url写入页面,同时将创建的日期设为今天。这样爬虫就会认为站点是实时更新的,从而提高搜索排名。然后就是sitemap.xml的源代码:
<?phperror_reporting(0);//禁止报错header("Content-type:text/xml"); //输出xml作为文档的头部echo '<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.chorder.net">';function _getUrlContent($url) { $handle = fopen($url, "r"); if ($handle) { $content = stream_get_contents($handle, 1024 * 1024); return $content; } else { return false; }}function _filterUrl($web_content) { $reg_tag_a = '/<[a|A].*?href=[\'\"]{0,1}([^>\'\"\ ]*).*?>/'; $result = preg_match_all($reg_tag_a, $web_content, $match_result); if ($result) { return $match_result[1]; } } function _reviseUrl($base_url, $url_list) { $url_info = parse_url($base_url); $base_url = $url_info["scheme"] . '://'; if ($url_info["user"] && $url_info["pass"]) { $base_url .= $url_info["user"] . ":" . $url_info["pass"] . "@"; } $base_url .= $url_info["host"]; if ($url_info["port"]) { $base_url .= ":" . $url_info["port"]; } $base_url .= $url_info["path"]; if (is_array($url_list)) { foreach ($url_list as $url_item) { if (preg_match('/^http/', $url_item)) { $result[] = $url_item; } else { $real_url = $base_url . '/' . $url_item; $result[] = $real_url; } } return $result; } else { return; } } function crawler($url) { $content = _getUrlContent($url); if ($content) { $url_list = _reviseUrl($url, _filterUrl($content)); if ($url_list) { return $url_list; } else { return ; } } else { return ; } } function main() { $current_url = "http://www.chorder.net"; $result_url_arr = crawler($current_url); if ($result_url_arr) { foreach ($result_url_arr as $url) { echo '<url><loc>'.$url.'</loc><lastmod>'.date("Y/m/d").'</lastmod><changefreq>always</changefreq> <priority>1.0</priority></url>'; } } echo '</urlset>';}main();?>
效果可以见 http://www.chorder.net/sitemap.xml

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Effective methods to prevent session fixed attacks include: 1. Regenerate the session ID after the user logs in; 2. Use a secure session ID generation algorithm; 3. Implement the session timeout mechanism; 4. Encrypt session data using HTTPS. These measures can ensure that the application is indestructible when facing session fixed attacks.

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To destroy a PHP session, you need to start the session first, then clear the data and destroy the session file. 1. Use session_start() to start the session. 2. Use session_unset() to clear the session data. 3. Finally, use session_destroy() to destroy the session file to ensure data security and resource release.

How to change the default session saving path of PHP? It can be achieved through the following steps: use session_save_path('/var/www/sessions');session_start(); in PHP scripts to set the session saving path. Set session.save_path="/var/www/sessions" in the php.ini file to change the session saving path globally. Use Memcached or Redis to store session data, such as ini_set('session.save_handler','memcached'); ini_set(


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