sitemap 文件的生成 sitemap文件和sitemapindex 索引文件的生成

<?php
/*****连接数据库     start*******/
$dbhost = "localhost";
$username = "root";
$userpass = "root";
$dbdatabase = "eoews";
$db_con = mysqli_connect($dbhost,$username,$userpass) or die("Unable to connect to the MySQL!");
//选择一个需要操作的数据库
mysqli_select_db($db_con,$dbdatabase);
/***********连接数据库****end******/

$page_size    =    10000; //每页条数
//1w个地址生成一个子地图，判断需要生成几个？
$countQuery = mysqli_query($db_con,"select count(id) from apps where status = 1 ");
$count = implode(',' , mysqli_fetch_row($countQuery));
$page_count = ceil($count/$page_size);  //分几个文件
baidu_create_index($page_count);
baidu_create_child($db_con,$page_count,$page_size);

//百度生成主sitemap
function baidu_create_index($page_count) {

    $content = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
    $content .= "<sitemapindex>";
    for($i=1;$i<=$page_count;$i++) {

        $content    .="<sitemap>";
        $content .= "<loc> http://test.demo.cn/sitemap/sitemap$i.xml</loc>";
        $content .= "<lastmod>".date('Y-m-d')."</lastmod>";
        $content .= "</sitemap>";
    }
    $content .= "</sitemapindex>";
    file_put_contents("sitemap.xml",$content);
}

//百度生成子sitemap
function baidu_create_child($db_con,$page_count,$page_size) {
    for($i=0;$i<$page_count;$i++) {

        $count = $i * $page_size;

        $result = mysqli_query($db_con,"SELECT id,updated_time FROM apps  ORDER BY updated_time desc limit $count,$page_size");
　　　　//提取数据
        if($result){
            $str = '<?xml version="1.0" encoding="utf-8"?>';
            $str .= '<urlset>';
            while($row = mysqli_fetch_array($result,MYSQLI_ASSOC))  {
                    $str .= '<url>';
                    $str .= "<loc>http://test.eoews.cn/soft/{$row["id"]}.html</loc>";
                    $str .= "<lastmod>" . date('Y-m-d',strtotime($row["updated_time"])) . "</lastmod>";
                    $str .= "<changefreq>daily</changefreq>";
                    $str .= "<priority>0.9</priority>";
                    $str .= '</url>';
            }
            $str .= '</urlset>';
            file_put_contents('sitemap/sitemap'.($i+1).".xml" ,$str);
        }else{
            die("fetch data failed!");
        }

         mysqli_free_result($result);
    }
}