本节内容：
php自动生成sitemap地图
例子，sitemap.inc.php：主要生成sitemap的类。
代码：
复制代码 代码示例:
<?php
// sitemap generator class
class Sitemap
{
// constructor receives the list of URLs to
include in the sitemap
function Sitemap($items = array())
{
$this->_items = $items;
}
// add a new sitemap item
function addItem($url,
$lastmod = ”,
$changefreq = ”,
$priority = ”,
$additional_fields = array())
{
$this->_items[] = array_merge(array(‘loc’ => $url,
‘lastmod’ => $lastmod,
‘changefreq’ => $changefreq,
‘priority’ => $priority),
$additional_fields);
}
// get Google sitemap
function getGoogle()
{
ob_start();
header(‘Content-type: text/xml’);
echo ‘<?xml version=”1.0″ encoding=”UTF-8″?>’;
echo ‘<urlset xmlns=”http://www.sitemaps.org/schemas/sitemap/0.9″
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
xsi:schemaLocation=”http://www.sitemaps.org/schemas/sitemap/0.9
http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd”>’;
foreach ($this->_items as $i)
{
echo ‘<url>’;
foreach ($i as $index => $_i)
{
if (!$_i)
continue;
echo “<$index>” . $this->_escapeXML($_i) . “</$index>”;
}
echo ‘</url>’;
}
echo ‘</urlset>’;
return ob_get_clean();
}
// escape string characters for inclusion in XML structure
function _escapeXML($str)
{
$translation = get_html_translation_table(HTML_ENTITIES, ENT_QUOTES);
foreach ($translation as $key => $value)
{
$translation[$key] = ‘&#’ . ord($key) . ‘;’;
}
$translation[chr(38)] = ‘&’;
return preg_replace(“/&(?![A-Za-z]{0,4}w{2,3};|#[0-9]{2,3};)/”,”&” ,
strtr($str, $translation));
}
}
?>
sitemap.php：调用sitemap.inc.php，具体实现sitemap。
复制代码 代码示例:
<?php
// redirect requests to dynamic to their keyword rich versions
require_once ‘/sitemap.inc.php’;
define(‘SITE_DOMAIN’, ‘http://www.jb200.com’);
// create the Sitemap object
$s = new Sitemap();
// add sitemap items
$s->addItem(SITE_DOMAIN);
$s->addItem(SITE_DOMAIN.”/aboutus.html”);
$s->addItem(SITE_DOMAIN.”/whatnew.php”);
…
//连接
数据库，生成URL并通过条用$s->addItem()加入到sitemap中。
// output sitemap
if (isset($_GET['target']))
{
// generate Google sitemap
if (($target = $_GET['target']) == ‘google’)
{
echo $s->getGoogle();
}
}
?>
说明：
.htaccess文件，重定向sitemap.xml文件到sitemap.php。
RewriteEngine on
RewriteRule ^sitemap.xml$ sitemap.php?target=google [L]
ping_google()函数，在网站内容更新的地方调用此函数，用于自动通知Google网站地图更新。
代码：
复制代码 代码示例:
<?php
function ping_google(){
$sitemapUrl = ‘http://www.jb200.com/sitemap.xml’;
$pingUrl = “http://www.google.com/webmasters/sitemaps/ping?sitemap=”.urlencode($sitemapUrl);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $pingUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch) or die (curl_error()); //执行curl请求
//echo $result;
curl_close($ch);
}
注意：此函数需要开启php的curl模块。
将以上代码加入到网站中，即可实现动态自动生成sitemap文件了，而且能够实时通知Google服务器网站内容更新。
