Parse XML namespaces with php SimpleXML
Solution 1:
I have given same type of answer here - solution to your question
You just need to register Namespace and then you can work normally with simplexml_load_file and XPath
<?php
$data = "http://alerts.weather.gov/cap/tx.php?x=1";
$entries = file_get_contents($data);
$entries = new SimpleXmlElement($entries);
if(count($entries)):
//echo "<pre>";print_r($entries);die;
//alternate way other than registring NameSpace
//$asin = $asins->xpath("//*[local-name() = 'ASIN']");
$entries->registerXPathNamespace('prefix', 'http://www.w3.org/2005/Atom');
$result = $entries->xpath("//prefix:entry");
//echo count($asin);
//echo "<pre>";print_r($result);die;
foreach ($result as $entry):
//echo "<pre>";print_r($entry);die;
$dc = $entry->children('urn:oasis:names:tc:emergency:cap:1.1');
echo $dc->event."<br/>";
echo $dc->effective."<br/>";
echo "<hr>";
endforeach;
endif;
That's it.
Solution 2:
Here's an alternative solution:
<?php
$xml = <<<XML
<?xml version = '1.0' encoding = 'UTF-8' standalone = 'yes'?>
<?xml-stylesheet href='http://alerts.weather.gov/cap/capatom.xsl' type='text/xsl'?>
<!--
This atom/xml feed is an index to active advisories, watches and warnings
issued by the National Weather Service. This index file is not the complete
Common Alerting Protocol (CAP) alert message. To obtain the complete CAP
alert, please follow the links for each entry in this index. Also note the
CAP message uses a style sheet to convey the information in a human readable
format. Please view the source of the CAP message to see the complete data
set. Not all information in the CAP message is contained in this index of
active alerts.
-->
<feed
xmlns = 'http://www.w3.org/2005/Atom'
xmlns:cap = 'urn:oasis:names:tc:emergency:cap:1.1'
xmlns:ha = 'http://www.alerting.net/namespace/index_1.0'
>
<!-- http-date = Tue, 07 May 2013 04:14:00 GMT -->
<id>http://alerts.weather.gov/cap/tx.atom</id>
<logo>http://alerts.weather.gov/images/xml_logo.gif</logo>
<generator>NWS CAP Server</generator>
<updated>2013-05-06T23:14:00-05:00</updated>
<author>
<name>[email protected]</name>
</author>
<title>Current Watches, Warnings and Advisories for Texas Issued by the National Weather Service</title>
<link href='http://alerts.weather.gov/cap/tx.atom'/>
<entry>
<id>http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFB8AA78.FireWeatherWatch.124EFFD70270TX.EPZRFWEPZ.1716207877d94d15d43d410892b9f175</id>
<updated>2013-05-06T23:14:00-05:00</updated>
<published>2013-05-06T23:14:00-05:00</published>
<author>
<name>[email protected]</name>
</author>
<title>Fire Weather Watch issued May 06 at 11:14PM CDT until May 08 at 10:00PM CDT by NWS</title>
<link href="http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFB8AA78.FireWeatherWatch.124EFFD70270TX.EPZRFWEPZ.1716207877d94d15d43d410892b9f175"/>
<summary>...CRITICAL FIRE CONDITIONS EXPECTED WEDNESDAY ACROSS FAR WEST TEXAS AND THE SOUTHWEST NEW MEXICO LOWLANDS... .WINDS ALOFT WILL STRENGTHEN OVER THE REGION EARLY THIS WEEK...AHEAD OF AN UPPER LEVEL TROUGH FORECAST TO MOVE THROUGH NEW MEXICO AND TEXAS ON WEDNESDAY. SURFACE LOW PRESSURE WILL ALSO DEVELOP TO OUR EAST AS THE TROUGH APPROACHES. THIS COMBINATION WILL RESULT</summary>
<cap:event>Fire Weather Watch</cap:event>
<cap:effective>2013-05-06T23:14:00-05:00</cap:effective>
<cap:expires>2013-05-08T22:00:00-05:00</cap:expires>
<cap:status>Actual</cap:status>
<cap:msgType>Alert</cap:msgType>
<cap:category>Met</cap:category>
<cap:urgency>Future</cap:urgency>
<cap:severity>Moderate</cap:severity>
<cap:certainty>Possible</cap:certainty>
<cap:areaDesc>El Paso; Hudspeth</cap:areaDesc>
<cap:polygon></cap:polygon>
<cap:geocode>
<valueName>FIPS6</valueName>
<value>048141 048229</value>
<valueName>UGC</valueName>
<value>TXZ055 TXZ056</value>
</cap:geocode>
<cap:parameter>
<valueName>VTEC</valueName>
<value>/O.NEW.KEPZ.FW.A.0018.130508T1900Z-130509T0300Z/</value>
</cap:parameter>
</entry>
<entry>
<id>http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFABB2F0.AirQualityAlert.124EFFC750DCTX.HGXAQAHGX.7f2cf548a67d403f0541492b2804d621</id>
<updated>2013-05-06T14:16:00-05:00</updated>
<published>2013-05-06T14:16:00-05:00</published>
<author>
<name>[email protected]</name>
</author>
<title>Air Quality Alert issued May 06 at 2:16PM CDT by NWS</title>
<link href="http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFABB2F0.AirQualityAlert.124EFFC750DCTX.HGXAQAHGX.7f2cf548a67d403f0541492b2804d621"/>
<summary>...OZONE ACTION DAY FOR TUESDAY... THE TEXAS COMMISSION ON ENVIRONMENTAL QUALITY (TCEQ)...HAS ISSUED AN OZONE ACTION DAY FOR THE HOUSTON...GALVESTON...AND BRAZORIA AREAS FOR TUESDAY...MAY 7 2013. ATMOSPHERIC CONDITIONS ARE EXPECTED TO BE FAVORABLE FOR PRODUCING HIGH LEVELS OF OZONE POLLUTION IN THE HOUSTON...GALVESTON AND</summary>
<cap:event>Air Quality Alert</cap:event>
<cap:effective>2013-05-06T14:16:00-05:00</cap:effective>
<cap:expires>2013-05-07T19:15:00-05:00</cap:expires>
<cap:status>Actual</cap:status>
<cap:msgType>Alert</cap:msgType>
<cap:category>Met</cap:category>
<cap:urgency>Unknown</cap:urgency>
<cap:severity>Unknown</cap:severity>
<cap:certainty>Unknown</cap:certainty>
<cap:areaDesc>Brazoria; Galveston; Harris</cap:areaDesc>
<cap:polygon></cap:polygon>
<cap:geocode>
<valueName>FIPS6</valueName>
<value>048039 048167 048201</value>
<valueName>UGC</valueName>
<value>TXZ213 TXZ237 TXZ238</value>
</cap:geocode>
<cap:parameter>
<valueName>VTEC</valueName>
<value></value>
</cap:parameter>
</entry>
</feed>
XML;
$sxe = new SimpleXMLElement($xml);
$capFields = $sxe->entry->children('cap', true);
echo "Event: " . (string) $capFields->event . "\n";
echo "Effective: " . (string) $capFields->effective . "\n";
echo "Expires: " . (string) $capFields->expires . "\n";
echo "Severity: " . (string) $capFields->severity . "\n";
Output:
Event: Fire Weather Watch
Effective: 2013-05-06T23:14:00-05:00
Expires: 2013-05-08T22:00:00-05:00
Severity: Moderate