找到一个功能齐全，代码清晰的PHP生成sitemap的类，大家可以参考一下.
<?php
/**
* 网站地图更新控制器
*
* @author Garbin
* @usage none
*/
class SitemapApp extends FrontendApp
{
function __construct()
{
$this->SitemapApp();
}
function SitemapApp()
{
parent::__construct();
$this->_google_sitemmap_file = ROOT_PATH . ‘/data/google_sitemmap.xml’;
}function index()
{
if (!Conf::get(‘sitemap_enabled’))
{
return;
}
$from = empty($_GET[‘from’]) ? ‘google’ : trim($_GET[‘from’]);
switch ($from)
{
case ‘google’:
$this->_output_google_sitemap();
break;
}
}/**
* 输出Google sitemap
*
* @author Garbin
* @return void
*/
function _output_google_sitemap()
{
header(“Content-type: application/xml”);
echo $this->_get_google_sitemap();
}/**
* 获取Google sitemap
*
* @author Garbin
* @return string
*/
function _get_google_sitemap()
{
$sitemap = “”;
if ($this->_google_sitemap_expired())
{
/* 已过期，重新生成 *//* 获取有更新的项目 */
$updated_items = $this->_get_updated_items($this->_get_google_sitemap_lastupdate());/* 重建sitemap */
$sitemap = $this->_build_google_sitemap($updated_items);/* 写入文件 */
$this->_write_google_sitemap($sitemap);
}
else
{
/* 直接返回旧的sitemap */
$sitemap = file_get_contents($this->_google_sitemmap_file);
}return $sitemap;
}/**
* 判断Google sitemap是否过期
*
* @author Garbin
* @return boolean
*/
function _google_sitemap_expired()
{
if (!is_file($this->_google_sitemmap_file))
{
return true;
}
$frequency = Conf::get(‘sitemap_frequency’) * 3600;
$filemtime = $this->_get_google_sitemap_lastupdate();return (time() >= $filemtime + $frequency);
}/**
* 获取上次更新日期
*
* @author Garbin
* @return int
*/
function _get_google_sitemap_lastupdate()
{
return is_file($this->_google_sitemmap_file) ? filemtime($this->_google_sitemmap_file) : 0;
}/**
* 获取已更新的项目
*
* @author Garbin
* @return array
*/
function _get_updated_items($timeline = 0)
{
$timeline && $timeline -= date(‘Z’);
$limit = 5000;
$result = array();
/* 更新的店铺 */
$model_store =& m(‘store’);
$updated_store = $model_store->find(array(
‘fields’ => ‘store_id, add_time’,
‘conditions’ => “add_time >= {$timeline} AND state=” . STORE_OPEN,
‘limit’ => “0, {$limit}”,
));if (!empty($updated_store))
{
foreach ($updated_store as $_store_id => $_v)
{
$result[] = array(
‘url’ => SITE_URL . ‘/index.php?app=store&id=’ . $_store_id,
‘lastmod’ => date(“Y-m-d”, $_v[‘add_time’]),
‘changefreq’=> ‘daily’,
‘priority’ => ‘1’,
);
}
}
/* 更新的文章 */
$model_article =& m(‘article’);
$updated_article = $model_article->find(array(
‘fields’ => ‘article_id, add_time’,
‘conditions’=> “add_time >= {$timeline} AND if_show=1”,
‘limit’ => “0, {$limit}”,
));
if (!empty($updated_article))
{
foreach ($updated_article as $_article_id => $_v)
{
$result[] = array(
‘url’ => SITE_URL . ‘/index.php?app=article&act=view&article_id=’ . $_article_id,
‘lastmod’ => date(“Y-m-d”, $_v[‘add_time’]),
‘changefreq’=> ‘daily’,
‘priority’ => ‘0.8’,
);
}
}/* 更新的商品 */
$model_goods =& m(‘goods’);
$updated_goods = $model_goods->find(array(
‘fields’ => ‘goods_id, last_update’,
‘conditions’ => “last_update >= {$timeline} AND if_show=1 AND closed=0”,
‘limit’ => “0, {$limit}”,
));
if (!empty($updated_goods))
{
foreach ($updated_goods as $_goods_id => $_v)
{
$result[] = array(
‘url’ => SITE_URL . ‘/index.php?app=goods&id=’ . $_goods_id,
‘lastmod’ => date(“Y-m-d”, $_v[‘last_update’]),
‘changefreq’=> ‘daily’,
‘priority’ => ‘0.8’,
);
}
}return $result;
}/**
* 生成Google sitemap
*
* @author Garbin
* @param array $items
* @return string
*/
function _build_google_sitemap($items)
{
$sitemap = “<?xml version=\”1.0\” encoding=\”UTF-8\”?>\r\n<urlset xmlns=\”http://www.sitemaps.org/schemas/sitemap/0.9\”>\r\n”;
$sitemap .= ” <url>\r\n <loc>” . htmlentities(SITE_URL, ENT_QUOTES) . “</loc>\r\n <lastmod>” . date(‘Y-m-d’, gmtime()) . “</lastmod>\r\n <changefreq>always</changefreq>\r\n <priority>1</priority>\r\n </url>”;
if (!empty($items))
{
foreach ($items as $item)
{
$sitemap .= “\r\n <url>\r\n <loc>” . htmlentities($item[‘url’], ENT_QUOTES) . “</loc>\r\n <lastmod>{$item[‘lastmod’]}</lastmod>\r\n <changefreq>{$item[‘changefreq’]}</changefreq>\r\n <priority>{$item[‘priority’]}</priority>\r\n </url>”;
}
}
$sitemap .= “\r\n</urlset>”;return $sitemap;
}/**
* 写入Google sitemap文件
*
* @author Garbin
* @param string $sitemap
* @return void
*/
function _write_google_sitemap($sitemap)
{
file_put_contents($this->_google_sitemmap_file, $sitemap);
}
}
?>
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