Parsing XML from URL using SimpleXML

问题

I'm trying to echo the XML content at this URL but I'm having difficulty. Here's what I have so far:

$url = "GetVideosServlet?queryId=1";

$xml = simplexml_load_file($url);

$value = (string) $xml->results->item[0]->id;

echo $value;

I keep getting the error that I'm trying to get the property of a non-object. But I was under the impression simplexml_load_file converts my XML string INTO an object??

If anyone could show me how to echo out any of the content, I'd be very grateful.

回答1:

I think you just miss a tag which is query, try:

$value = (string) $xml->query->results->item[0]->id;
echo $value;

回答2:

When you are debugging print_r and var_dump are very handy! for example in this case if you dumped the $xml right after loading it you would have noticed that you missed out the SimpleXMLElement Object query.

$url = "http://176.34.224.80/REMPADRecSys/GetVideosServlet?queryId=1";
$xml = simplexml_load_file($url);
echo "<pre>";
print_r($xml);

Would give you the output:

SimpleXMLElement Object
(
    [query] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [id] => 1
                )

            [results] => SimpleXMLElement Object
                (
                    [item] => Array
                        (
                            [0] => SimpleXMLElement Object
                                (
                                    [id] => GZ7w39jpqwo
                                    [rank] => 1
                                    [explanation] => Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla a massa lectus, sed convallis sapien. Curabitur sem mauris, ullamcorper ut. 
                                )

and so the correct reference would have been $xml->query->results->item[0]->id; like @Lake mentioned. Happy debugging.

回答3:

simplexml_load_file(rawurlencode('http://176.34.224.80/REMPADRecSys/GetVideosServlet?queryId=1'));

try this.

来源：https://stackoverflow.com/questions/11292475/parsing-xml-from-url-using-simplexml

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php

xml

url

simplexml