PHP class that generates Baidu sitemap sitemap

<?php
/*
 * SiteMap接口类
 */
class SitemapAction extends Action{
  private static $baseURL = ''; //URL地址
  private static $askMobileUrl = 'http://m.xxx.cn/ask/'; //问答移动版地址
  private static $askPcUrl = "http://www.xxx.cn/ask/";   //问答pc地址
  private static $askZonePcUrl = "http://www.xxx.cn/ask/jingxuan/"; //问答精选Pc链接
  private static $askZoneMobileUrl = "http://m.xxx.cn/ask/jx/"; //问答精选移动版链接
  //问答setmaps
  public function askSetMap(){
    header('Content-type:text/html;charset=utf-8');
    //获取问题列表
    $maxid = 0;    //索引文件最大id
    $minid = 0;    //索引文件最小id
    $psize = 1000; //数据库每次取数量
    $maxXml = 5000; //xml写入记录数量
    $where = array();
    //读取索引文件
    $index = APP_PATH.'setmapxml/Index.txt';
    //关联setmaps路径
    $askXml = "../siteditu/ask/ask.xml";
    if(!file_exists($index)){
      $fp=fopen("$index", "w+");
      if ( !is_writable($index) ){
        die("文件:" .$index. "不可写，请检查！");
      }

First take out 1000 pieces of data (which can be more flexible and convenient for later modification), and then generate xml format files in a loop. file_puts_contens writes files. Then write the name of the generated xml file, the minimum id of the retrieved question, the maximum id of the retrieved question, and the number of retrieved questions into a txt file for index query. The format is roughly like this.
0,3146886,3145887,1000
Did you find that the last number is 1000? The first time you select, take out 1000 pieces of data, and then write it into the 0.xml file. Write the extracted xml file name, minimum id, maximum id, and number of entries into the index query txt. For the first time, 1,000 pieces of data were written to 0.xml, and the number of pieces generated was 1,000. The select statement will become when querying for the second time. where id > The maximum id taken out (currently mysql is a forward order query, if it is in reverse order, change it to less than) limit 1000 In this case, take out 1000, and then modify the minimum id and maximum id of the index query txt, and add the number of generated items to 2000 . By analogy, when the number of generated items reaches 5000, start another line and write it into the index file, similar to this
0,3146886,3145887,5000
1,3148886,3147887,1000
If you write it like this, it will reduce the problem. reduces the pressure on the server.

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