更新百度sitemap.xml,适用于tp5及tp6

##更新百度sitemap.xml,适用于tp5及tp6

> 大家将代码拿去做适当简化

```
//更新网站sitemap
    public function sitemap()
    {
        $ids = Db::name("article")->field("id,last_time")->order("id DESC")->select()->toArray();
        //$ids = array_column($ids["id"]);
        $url = [];

$xml = '<?xml version="1.0" encoding="utf-8"?>'.PHP_EOL;
        $xml .= '<urlset>'.PHP_EOL;
        foreach ($ids as $v){
            $t = request()->domain().(string)url('Article/read',["id"=>$v["id"]]);
            array_push($url,$t);
            $xml .= "<url>
                <loc>{$t}</loc>
                <lastmod>".date("Y-m-d H:i:s",$v['last_time'])."</lastmod>
                <changefreq>daily</changefreq>
                <priority>0.8</priority>
            </url>".PHP_EOL;

}
        $xml .='</urlset>'.PHP_EOL;
        file_put_contents("./sitemap.xml",$xml);
        $push_res = push_to_baidu($url);
        $push_res = json_decode($push_res,true);
        if(isset($push_res["success"])){
            $msg="成功,并且推送成功，今日剩余推送".$push_res["remain"]."条";
        }else{
            $msg="成功,推送接口错误，请手动推送";
        }
        return $msg;
    }
```

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