xml - php domdocument How to read a document using a url

Question

Because of project needs, I need to use php to modify the value on xml. Use DOMdocument to do it.
The code is as follows

 $xmlpatch ='http://www.*****.com/vr/wtest/vtour/tour.xml';
        $xml = simplexml_load_file($url);
        $doc = new DOMDocument();
        $doc -> formatOutput = true;
        if($doc -> load($xmlpatch)) {
        $root = $doc -> documentElement;
        $elm = $root -> getElementsByTagName('scene');
        $hotspot = $elm[1] ->getElementsByTagName('hotspot');
        $hotspot[0] ->setAttribute('videourl',$videourl1);
        $hotspot[1] ->setAttribute('onclick',$videourl2);
    
    
        $doc->save($xmlpatch);
        } 

The code should be fine. The problem is that I originally wrote a relative path in $xmlpatch. Because I used the local environment package, there is no problem.
But the environment php files and xml on the server are placed across domains, so I changed them to absolute paths. But I found that the script failed. Someone online suggested using simplexml to do it. But I can indeed read it after experimenting, but I can't find a function to modify attributes on w3cschool.
Please help me~ I would be very grateful~ Can you tell me how to modify the attributes of simplexml, or how to read the domdocument using the url.

Answer 1

First use curl to read the information of the xml file, and then use DOMdocument or simplexml to process it.

<?php

$url = 'http://www.abc.com/sitemap.xml';

$header = array(
    'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0',
    'Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
    'Accept-Encoding: gzip, deflate',
);

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
$data = curl_exec($curl);
curl_close($curl);

if ($xml = simplexml_load_string($data)) {
    $xml->row->name = 'new_name'; // Edit XML Object node
    echo $xml->asXML();
}