无法从xml文件中读取。 调用非对象上的成员函数

Question

I have the following code that must read xml data from a database from different servers.

foreach($servers->result() as $server){
    $srvr = $server->ip;
    $loading_server = "http://".$srvr."/status.xml";
    $doc = new DOMDocument();
    $status = $doc->load($loading_server);
    $power_out = $status->getElementsByTagName( "input0" );
    $temperature = $status->getElementsByTagName( "input1" );
    $rf_antenna_power = $status->getElementsByTagName( "input2" );
    echo "<b>$srvr: $power_out - $temperature - $rf_antenna_power 
</b><br>";
}

each server has got a status report in a status.xml file which is something like this:

<response>
<input0>1</input0>
<input1>0</input1>
<input2>0</input2>
<input3>0</input3>
<input4>0</input4>
...
..
<response>

But I get the bellow error:

Fatal error: Call to a member function getElementsByTagName() on a non-object in D:\xampp\htdocs\transmitter\application\views\body.php on line 10

I thought of using $dom->loadHTML(file_get_contents($wrss)); to access the xml content but yet I cant and get the warning:

DOMDocument::loadHTML(): Tag response invalid in Entity

Please help me in this!

Answer 1

DomDocument::load return only bool in non-static call: http://php.net/manual/en/domdocument.load.php

Right using to example:

if ($status){
    $doc->getElementsByTagName( "input0" );
}