I'm using SimpleXML . I want to get this node's text attribute.
<yweather:condition text="Mostly Cloudy" ......
I'm using this it's not working :
$xml->children("yweather", TRUE)->condition->attributes()->text;
Do a print_r() on $xml to see how the structure looks. From there you should be able to see how to access the information.
It looks like you are trying to access an attribute, which is stored in an array in $xml->yweather->attributes() so:
$attributes = $xml->condition->attributes();
$weather = $attributes['text'];
To deal with the namespace, you need to use children() to get the members of that namespace.
$weather_items = $xml->channel->item->children("http://xml.weather.yahoo.com/ns/rss/1.0");
It might help to mention that the string you showed is part of a feed, specifically the RSS formatted Yahoo Weather feed.
You would probably use $xml->condition but there may be branches before that.
Related
Very stumped by this one. In PHP, I'm fetching a YouTube user's vids feed and trying to access the nodes, like so:
$url = 'http://gdata.youtube.com/feeds/api/users/HCAFCOfficial/uploads';
$xml = simplexml_load_file($url);
So far, so fine. Really basic stuff. I can see the data comes back by running:
echo '<p>Found '.count($xml->xpath('*')).' nodes.</p>'; //41
echo '<textarea>';print_r($xml);echo '</textarea>';
Both print what I would expect, and the print_r replicates the XML structure.
However, I have no idea why this is returning zero:
echo '<p>Found '.count($xml->xpath('entry')).'"entry" nodes.</p>';
There blatantly are entry nodes in the XML. This is confirmed by running:
foreach($xml->xpath('*') as $node) echo '<p>['.$node->getName().']</p>';
...which duly outputs "[entry]" 25 times. So perhaps this is a bug in SimpleXML? This is part of a wider feed caching system and I'm not having any trouble with other, non-YT feeds, only YT ones.
[UPDATE]
This question shows that it works if you do
count($xml->entry)
But I'm curious as to why count($xml->xpath('entry')) doesn't also work...
[Update 2]
I can happily traverse YT's anternate feed format just fine:
http://gdata.youtube.com/feeds/base/users/{user id}/uploads?alt=rss&v=2
This is happening because the feed is an Atom document with a defined default namespace.
<feed xmlns="http://www.w3.org/2005/Atom" ...
Since a namespace is defined, you have to define it for your xpath call too. Doing something like this works:
$url = 'http://gdata.youtube.com/feeds/api/users/HCAFCOfficial/uploads';
$xml = simplexml_load_file($url);
$xml->registerXPathNamespace('ns', 'http://www.w3.org/2005/Atom');
$results = $xml->xpath('ns:entry');
echo count($results);
The main thing to know here is that SimpleXML respects any and all defined namespaces and you need to handle them accordingly, including the default namespace. You'll notice that the second feed you listed does not define a default namespace and so the xpath call works fine as is.
I need to traverse a dbpedia's xml resource file to get the abstract and some other basic information like formation year and budget.
An example for this would be the US EPA.(the bottom of the page has links to different data formats of the same file)
I only need the first rdf:Description namespace of the xml file. A snippet of the code
$xml_result = file_get_contents($xml_url);
$xml_data = simplexml_load_string($xml_result);
$namespaces = $xml_data->getNamespaces(true);
//print_r($namespaces);
$current = $xml_data->children($namespaces['rdf']);
This only gets me the rdf elements inside the first rdf:Description. how do i get access to other elements like the dbpedia-owl namespace elements inside the Description element ?
You can use multiple namespaces, see https://stackoverflow.com/a/13350242/865201
Without testing it, I think you can use something like
$xml_data->children($namespaces['rdf'])->Description->children($namespaces['dbpedia-owl'])->anotherElement;
I'm trying to get the $xml->entry->yt:statistics->attributes()->viewCount attribute, and I've tried some stuff with SimpleXML, and I can't really get it working!
Attempt #1
<?php
$xml = simplexml_load_file("http://gdata.youtube.com/feeds/api/videos?author=Google");
echo $xml->entry[0]->yt:statistics['viewCount'];
?>
Attempt #2
<?php
$xml = simplexml_load_file("http://gdata.youtube.com/feeds/api/videos?author=Google");
echo $xml->entry[0]->yt:statistics->attributes()->viewCount;
?>
Both of which return blank, though SimpleXML is working, I tried to get the feed's title, which worked!
Any ideas?
I've looked at loads of other examples on SO and other sites, but somehow this isn't working? does PHP recognize the ':' to be a cut-off, or am I just doing something stupid?
Thank you, any responses greatly appreciated!
If you just want to get the viewcount of a youtube video then you have to specify the video ID. The youtube ID is found in each video url. For example "http://www.youtube.com/watch?v=ccI-MugndOU" so the id is ccI-MugndOU. In order to get the viewcount then try the code below
$sample_video_ID = "ccI-MugndOU";
$JSON = file_get_contents("http://gdata.youtube.com/feeds/api/videos?q={$sample_video_ID}&alt=json");
$JSON_Data = json_decode($JSON);
$views = $JSON_Data->{'feed'}->{'entry'}[0]->{'yt$statistics'}->{'viewCount'};
echo $views;
I would use the gdata component from the zend framework. Is also available as a separate module, so you don't need to use the whole zend.
The yt: prefix marks that element as being in a different "XML namespace" from the rest of the document. You have to tell SimpleXML to switch to that namespace using the ->children() method.
The line you were attempting should actually look like this:
echo (string)$xml->entry[0]->children('yt', true)->statistics->attributes(NULL)->viewCount;
To break this down:
(string) - this is just a good habit: you want the string contents of the attribute, not a SimpleXML object representing it
$xml->entry[0] - as expected
->children('yt', true) - switch to the namespace with the local alias 'yt'
->statistics - as expected
->attributes(NULL) - technically, the attribute "viewCount" is back in the default namespace, because it is not prefixed with "yt:", so we have to switch back in order to see it
->viewCount - running ->attributes() gives us nothing but attributes, which are accessed with ->foo not ['foo']
I'm trying to get an xml stream by using curl. I've recieved the string with curl but I'm having troubles parsing the xmlstream with SimpleXML. The url im using is http://www.google.com/books/feeds/volumes/fR4vqfywNlgC
and it seems to be ignoring the parts containing "dc". Why?
The dublin core data (at least, I'm assuming that's what the DC prefix means in this case) uses its own namespace. You need to refer to that namespace when retrieving these elements. This can be done using the 'children' method.
Example:
$sxml = simplexml_load_string($xml);
$dcData = $sxml->children('dc', TRUE);
echo (string)$dcData->creator;
An article/posting detailing the problem and solution can be found here.
http://blogs.sitepoint.com/simplexml-and-namespaces/
Greetings,
I am having some difficulty understanding how to parse NOAA's Weather Alert CAP in PHP. I need to do the following:
Locate the proper county in the feed
Verify that there is an active alert
Display the alert's description
The feed I am working with is at this address - http://www.weather.gov/alerts/va.cap
I have used simplexml_load_string() in the past for this sort of thing but it does not seem to work for this feed.
Thanks!
After some more time on Google I came across a script that does exactly what I am trying to do. Rather than try to reinvent the wheel, I am going to go with it. http://saratoga-weather.org/scripts-atom.php#atomadvisory
You are probably having an issue due to the namespace
<cap:alert xmlns:cap='http://www.incident.com/cap/1.0'>
This should give you an idea of how to extract information
$sxe = simplexml_load_file('http://www.weather.gov/alerts/va.cap');
foreach ($sxe->getDocNamespaces() as $ns => $uri) {
$sxe->registerXPathNamespace($ns, $uri);
}
foreach($sxe->xpath('//cap:areaDesc') as $areaDesc) {
echo $areaDesc;
}
On a sidenote, SimpleXml is for simple XML only. Consider using DOM instead.