XML Assign More Than One Result To PHP Variable - php

Question

I have done a bit of searching on this, but am just not sure I am searching for the right thing. Examples and things I have found have just confused me and possibly sent me in the wrong direction.
I am trying to figure out a php while statement, or if statement to return the results of XML output. The thing is the row/section I need may not always be the same number of results returned. For example there are ShoutCast streams, some have 1 mount point, and some have 3 mount points. Each mount point can have a different amount of listeners tuned in to that particular mount.
My Goal: To get the integer from all mount points returned in the XML, add them together to make a grand total of listeners.
The XML
<centovacast version="3.1.2" host="host.net">
<response type="success">
<message>Complete</message>
<data>
<status>
<mount>/stream</mount>
<sid>1</sid>
<listenercount>31</listenercount>
<genre>Blues</genre>
<url>http://www.websiteurl.com</url>
<title>Streams Name</title>
<currentsong>Artist Name - Track Name</currentsong>
<bitrate>128</bitrate>
<sourceconnected>1</sourceconnected>
<codec>audio/mpeg</codec>
<displayname>/stream</displayname>
<serverstate>1</serverstate>
<appstate>
<sctrans2>1</sctrans2>
</appstate>
<sourcestate>1</sourcestate>
<reseller/>
<useserver>1</useserver>
<ipaddress>11.11.111.111</ipaddress>
<port>8031</port>
<proxy>0</proxy>
<servertype>ShoutCast2</servertype>
<sourcetype>sctrans2</sourcetype>
</status>
<mountpoints>
<row>
<mount>/stream</mount>
<sid>1</sid>
<listenercount>31</listenercount>
<genre>Blues</genre>
<url>http://www.websiteurl.com</url>
<title>Stream Title Name</title>
<currentsong>Artist Name - Track Name</currentsong>
<bitrate>128</bitrate>
<sourceconnected>1</sourceconnected>
<codec>audio/mpeg</codec>
<displayname>/stream</displayname>
</row>
<row>
<mount>/live</mount>
<sid>2</sid>
<listenercount>0</listenercount>
<genre/>
<url/>
<title/>
<currentsong/>
<bitrate>0</bitrate>
<sourceconnected>0</sourceconnected>
<codec/>
<displayname>/live</displayname>
</row>
</mountpoints>
</data>
</response>
</centovacast>
So on the above I know how to pull the listeners for each mount individually using the following code.
$countlisteners->response->data->mountpoints->row[0]->listenercount;
That gives me the result for the first mount, and switching the 0 to a 1 gives me the second mount, so on and so forth.
What I need is for php that will count how many of those mounts exist, and assign each result to a variable I can then use to add together to get a grand total. Is there a way to do this?
What about doing something like this?
$countlisteners = simplexml_load_file('http://urltoxml.com');
foreach($countlisteners->response->data->mountpoints->row->listenercount as $result){
$total = $result;
echo $total;
}

Answer 1

You can use DOMDocument for extracting all mountpoint tags
<?php
$xml="Your xml document content here";
$dom = new DOMDocument;
$dom->loadXML($xml);
$books = $dom->getElementsByTagName('mountpoints');
foreach ($mountpoints as $mountpoints) {
echo $mountpoints->nodeValue;
//you can add your count variable here
//nodeValues can be assigned to varables
}
?>

Answer 2

I figured it out. So simplistic, yet hard to figure out.
$total = 0;
foreach($countlisteners->response->data->mountpoints->row as $result){
$total += $result->listenercount;
$items++;
}
echo $total;

Answer 3

You normally do that with Xpath. It's a query language for XML documents.
You're interested in all listenercount elements, the Xpath expression for these elements could be as simple as:
//listenercount
When you now use SimpleXML to parse the document, the following line of code gives you three SimpleXMLElements inside an array that represent the three values you want to create the sum of:
$array = simplexml_load_string($buffer)->xpath('//listenercount');
As you need the sum of the integer values of these three elements, it can be easily processed with array_map and array_sum:
$sum = array_sum(array_map('intval', $array));
And this gives you in $sum what you're looking for:
var_dump($sum); # int(62)
I hope this sheds you some light why it's often better to get the information you're looking for with an xpath query from the document instead of writing many lines of code to traverse the document "on your own".
The full example:
$buffer = <<<XML
<centovacast version="3.1.2" host="host.net">
<response type="success">
<message>Complete</message>
<data>
<status>
<mount>/stream</mount>
<sid>1</sid>
<listenercount>31</listenercount>
<genre>Blues</genre>
<url>http://www.websiteurl.com</url>
<title>Streams Name</title>
<currentsong>Artist Name - Track Name</currentsong>
<bitrate>128</bitrate>
<sourceconnected>1</sourceconnected>
<codec>audio/mpeg</codec>
<displayname>/stream</displayname>
<serverstate>1</serverstate>
<appstate>
<sctrans2>1</sctrans2>
</appstate>
<sourcestate>1</sourcestate>
<reseller/>
<useserver>1</useserver>
<ipaddress>11.11.111.111</ipaddress>
<port>8031</port>
<proxy>0</proxy>
<servertype>ShoutCast2</servertype>
<sourcetype>sctrans2</sourcetype>
</status>
<mountpoints>
<row>
<mount>/stream</mount>
<sid>1</sid>
<listenercount>31</listenercount>
<genre>Blues</genre>
<url>http://www.websiteurl.com</url>
<title>Stream Title Name</title>
<currentsong>Artist Name - Track Name</currentsong>
<bitrate>128</bitrate>
<sourceconnected>1</sourceconnected>
<codec>audio/mpeg</codec>
<displayname>/stream</displayname>
</row>
<row>
<mount>/live</mount>
<sid>2</sid>
<listenercount>0</listenercount>
<genre/>
<url/>
<title/>
<currentsong/>
<bitrate>0</bitrate>
<sourceconnected>0</sourceconnected>
<codec/>
<displayname>/live</displayname>
</row>
</mountpoints>
</data>
</response>
</centovacast>
XML;
$array = simplexml_load_string($buffer)->xpath('//listenercount');
$sum = array_sum(array_map('intval', $array));
var_dump($sum);