sitemap xml文件生成

sitemap xml生成方法

<?php
/**
 * SitemapService.php.
 *
 * 生成sitemap
 */

class Sitemap
{
    public $newLine = "
";
    public $indent = " ";
    public $xmlHeader = "<?xml version="1.0" encoding="UTF-8"?>
";
    public $urlsetOpen = "<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">
";
    public $urlsetValue = "";
    public $urlsetClose = "</urlset>
";

    public $rootUrl = "";
    public function __construct($rootUrl = "https://www.xxx")
    {
        if (empty($rootUrl)) {
            $rootUrl = "https://www.xxx";
        }
        $this->rootUrl = $rootUrl;
    }

    private function makeUrlString ($urlString) {
        return htmlentities($urlString, ENT_QUOTES|ENT_XML1, 'UTF-8');
    }

    /**
     * 返回格式: 2019-02-01T12:40:05+00:00
     * 参数格式: 2019-02-01 12:40:05
     * @param $dateTime
     * @return bool|string
     */
    private function makeIso8601TimeStamp ($dateTime) {
        if (!$dateTime) {
            $dateTime = date('Y-m-d H:i:s');
        }
        if (is_numeric(substr($dateTime, 11, 1))) {
            $isoTS = substr($dateTime, 0, 10) ."T"
                .substr($dateTime, 11, 8) ."+00:00";
        } else {
            $isoTS = substr($dateTime, 0, 10);
        }
        return $isoTS;
    }

    private function makeUrlTag ($url, $modifiedDateTime, $changeFrequency, $priority) {
        $newLine = $this->newLine;
        $indent = $this->indent;

        $urlOpen = "$indent<url>$newLine";
        $urlClose = "$indent</url>$newLine";
        $locOpen = "$indent$indent<loc>";
        $locClose = "</loc>$newLine";
        $lastmodOpen = "$indent$indent<lastmod>";
        $lastmodClose = "</lastmod>$newLine";
        $changefreqOpen = "$indent$indent<changefreq>";
        $changefreqClose = "</changefreq>$newLine";
        $priorityOpen = "$indent$indent<priority>";
        $priorityClose = "</priority>$newLine";

        $urlTag = $urlOpen;
        $urlValue = $locOpen .$this->makeUrlString($url) .$locClose;
        if ($modifiedDateTime) {
            $urlValue .= $lastmodOpen .$this->makeIso8601TimeStamp($modifiedDateTime) .$lastmodClose;
        }
        if ($changeFrequency) {
            $urlValue .= $changefreqOpen .$changeFrequency .$changefreqClose;
        }
        if ($priority) {
            $urlValue .= $priorityOpen .$priority .$priorityClose;
        }
        $urlTag .= $urlValue;
        $urlTag .= $urlClose;
        return $urlTag;
    }

    /**
     * 验证是否符合url格式
     * url format: /xxx|lastmod|changefreq|priority
     *
     * @param $pageLine
     * @return bool
     */
    private function validateEntry ($pageLine) {
        $page = explode("|", $pageLine);
        $url = trim($page[0]);
        $processLine = TRUE;
        if (substr($url, 0, 1) != "/") {
            $processLine = FALSE;
        }
        return $processLine;
    }

    /**
     * 获取待生成的链接
     * url format: /xxx|lastmod|changefreq|priority
     *
     * @return array
     */
    private function getUrls()
    {
        $lastmod = date('Y-m-d H:i:s');
        $changefreq = "daily";
        $priority_index = "1.0";
        $priority_category = "0.8";
        $priority_details = "0.5";
        $pageList = [];
        $pageList[] = "/|$lastmod|$changefreq|$priority_index";
        // 添加自己的网站url
        $pageList[] = "/ranking|$lastmod|$changefreq|$priority_category";
        return $pageList;
    }

    /**
     * 生成sitemap文件
     */
    public function generate()
    {
        $pageList = $this->getUrls();
        foreach($pageList as $pageLine) {
            $processLine = $this->validateEntry ($pageLine);
            $page = explode("|", $pageLine);
            $url = trim($page[0]);
            if ($processLine) {
                $this->urlsetValue .= $this->makeUrlTag ($this->rootUrl .$url, trim($page[1]),   trim($page[2]), trim($page[3]));
            }
        }
        return $this->xmlHeader . $this->urlsetOpen . $this->urlsetValue . $this->urlsetClose;
    }
}

/**
 * 1. Sitemap 构造方法，默认的rootUrl 修改为待整理的网站域名
 * 2. Sitemap getUrls方法，添加自己网站的url
 * 3. 调用Sitemap时，rootUrl的参数修改
 */

$rootUrl = ""; 
$sitemap = new Sitemap($rootUrl);
$xml_data = $sitemap->generate();
header('Content-type: application/xml; charset="utf-8"');
echo $xml_data;

参考链接

谷歌帮助文档
sitemap xml格式
谷歌seo优化