如何用laravel生成sitemap

    //sitemap     Route::get('/sitemap/m/{type}.xml', 'SitemapController@siteMap');

<?php namespace AppHttpControllersM; use AppHttpControllersBaseController; use AppModelBbsArticle; use AppModelBbsAsk; use AppModelBbsThread; use AppModelMainVideo; use AppModelGarageSeriesInfoModel; //todo 补充其他模块 use CarbonCarbon; use IlluminateSupportFacadesCache; class SitemapController extends BaseController {     //todo 写一个汇总文件     public function siteMap($type)     {         $cacheKey = "site-" . $type;         //2小时缓存 保证加载速度         if (Cache::has($cacheKey)) {             $siteMap = Cache::get($cacheKey);         } else {             $siteMap = $this->buildSiteMap($type);             Cache::add($cacheKey, $siteMap, 120);         }         return response($siteMap)             -&gt;header('Content-type', 'text/xml');     }     /**      * Build the Site Map      */     protected function buildSiteMap($type)     {         $sitemapInfo = [];         switch ($type) {             case 'video':                 $sitemapInfo = $this-&gt;getVideoInfo();                 break;             case 'article':                 $sitemapInfo = $this-&gt;getArticleInfo();                 break;             case 'bbs':                 $sitemapInfo = $this-&gt;getBbsInfo();                 break;             case 'ask':                 $sitemapInfo = $this-&gt;getAskInfo();                 break;             case 'series':                 $sitemapInfo = $this-&gt;getSeriesInfo();//车型库                 break;         }         $lastmod = $sitemapInfo[0]['pub_time'];         $xml = [];         $xml[] = '<?xml  version="1.0" encoding="UTF-8"?&#39; . &#39;>';         $xml[] = '<urlset>';         $xml[] = '  <url>';         $xml[] = "    <loc>https://m.xxx.com</loc>";         $xml[] = "    <lastmod>$lastmod</lastmod>";         $xml[] = '    <changefreq>daily</changefreq>';         $xml[] = '    <priority>0.8</priority>';         $xml[] = '  </url>';         foreach ($sitemapInfo as $sitemap) {             $xml[] = '  <url>';             $xml[] = "    <loc>{$sitemap['url']}</loc>";             $xml[] = "    <mobile></mobile>";             $xml[] = "    <lastmod>{$sitemap['pub_time']}</lastmod>";             $xml[] = "  </url>";         }         $xml[] = '</urlset>';         return join("n", $xml);     }     /**      * Return all the posts as $url =&gt; $date      */     protected function getVideoInfo()     {         $videos = Video::where('pub_time', 'where('published', 2)             -&gt;where('is_del', 0)             -&gt;orderBy('id', 'desc')             -&gt;pluck('pub_time', 'id')             -&gt;all();         $res = $article = [];         foreach ($videos as $id =&gt; $pub_time) {             $article['id'] = $id;             $article['pub_time'] = substr($pub_time, 0, 10);             $article['url'] = "https://m.xxx.com/video_" . $id . ".html";             $res[] = $article;         }         return $res;     }     protected function getArticleInfo()     {         $articles = Article::where('pub_time', 'where('published', 2)             -&gt;where('is_del', 0)             -&gt;orderBy('id', 'desc')             -&gt;pluck('pub_time', 'id')             -&gt;take(5000)             -&gt;all();         $res = $article = [];         foreach ($articles as $id =&gt; $pub_time) {             $article['id'] = $id;             $article['pub_time'] = substr($pub_time, 0, 10);             $article['url'] = "https://m.xxx.com/news/article_" . $id . ".html";             $res[] = $article;         }         return $res;     }     protected function getBbsInfo()     {         $articles = Thread::where('visible', 1)             -&gt;where('is_del', 0)             -&gt;orderBy('id', 'desc')             -&gt;pluck('dateline', 'id')             -&gt;take(10000)             -&gt;all();         $res = $article = [];         foreach ($articles as $id =&gt; $pub_time) {             $article['id'] = $id;             $article['pub_time'] = substr($pub_time, 0, 10);             $article['url'] = "https://m.xxx.com/bbs/thread_" . $id . ".html";             $res[] = $article;         }         return $res;     }     protected function getAskInfo()     {         $articles = Ask::where('state', 1)             -&gt;orderBy('id', 'desc')             -&gt;pluck('dateline', 'id')             -&gt;take(10000)             -&gt;all();         $res = $article = [];         foreach ($articles as $id =&gt; $pub_time) {             $article['id'] = $id;             $article['pub_time'] = substr($pub_time, 0, 10);             $article['url'] = "https://m.xxx.com/ask_" . $id . ".html";             $res[] = $article;         }         return $res;     }     //车型库     protected function getSeriesInfo()     {         $articles = SeriesInfoModel::where('status', 1)             -&gt;where('is_stop', 0)             -&gt;pluck('name', 'id')             -&gt;all();         $res = $article = [];         foreach ($articles as $id =&gt; $pub_time) {             $article['id'] = $id;             $article['pub_time'] = date('Y-m-d', time());             $article['url'] = "https://m.xxx.com/series/" . $id . "/details";             $res[] = $article;         }         return $res;     } }