使用 php SimpleXML 解析 XML 命名空间
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时间：2020-08-25 11:04:40 来源:igfitidea点击:
Parse XML namespaces with php SimpleXML
提问by Texan78
I know this has been asked many many times but I haven't been able to get any of the suggestions to work with my situation and I have searched the web and here and tried everything and anything and nothing works. I just need to parse this XML with the namespace cap: and just need four entries from it.
我知道这已经被问过很多次了，但我没有得到任何建议来解决我的情况，我在网上和这里搜索过，尝试了一切，但没有任何效果。我只需要使用命名空间上限解析这个 XML：并且只需要从中获取四个条目。
<?xml version="1.0" encoding="UTF-8"?>
<entry>
<id>http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFB832F0.SpecialWeatherStatement.124EFFB84164TX.LUBSPSLUB.ac20a1425c958f66dc159baea2f9e672</id>
<updated>2013-05-06T20:08:00-05:00</updated>
<published>2013-05-06T20:08:00-05:00</published>
<author>
<name>[email protected]</name>
</author>
<title>Special Weather Statement issued May 06 at 8:08PM CDT by NWS</title>
<link href="http://alerts.weather.gov/cap/wwacapget.php?x=TX124EFFB832F0.SpecialWeatherStatement.124EFFB84164TX.LUBSPSLUB.ac20a1425c958f66dc159baea2f9e672"/>
<summary>...SIGNIFICANT WEATHER ADVISORY FOR COCHRAN AND BAILEY COUNTIES... AT 808 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 30 MILES NORTHWEST OF MORTON...MOVING SOUTHEAST AT 25 MPH. NICKEL SIZE HAIL...WINDS SPEEDS UP TO 40 MPH...CONTINUOUS CLOUD TO GROUND LIGHTNING...AND BRIEF MODERATE DOWNPOURS ARE POSSIBLE WITH</summary>
<cap:event>Special Weather Statement</cap:event>
<cap:effective>2013-05-06T20:08:00-05:00</cap:effective>
<cap:expires>2013-05-06T20:45:00-05:00</cap:expires>
<cap:status>Actual</cap:status>
<cap:msgType>Alert</cap:msgType>
<cap:category>Met</cap:category>
<cap:urgency>Expected</cap:urgency>
<cap:severity>Minor</cap:severity>
<cap:certainty>Observed</cap:certainty>
<cap:areaDesc>Bailey; Cochran</cap:areaDesc>
<cap:polygon>34.19,-103.04 34.19,-103.03 33.98,-102.61 33.71,-102.61 33.63,-102.75 33.64,-103.05 34.19,-103.04</cap:polygon>
<cap:geocode>
<valueName>FIPS6</valueName>
<value>048017 048079</value>
<valueName>UGC</valueName>
<value>TXZ027 TXZ033</value>
</cap:geocode>
<cap:parameter>
<valueName>VTEC</valueName>
<value>
</value>
</cap:parameter>
</entry>
I am using simpleXML and I have a small simple test script set up and it works great for parsing regular elements. I can't for the dickens of me find or get a way to parse the elements with the namespaces.
我正在使用 simpleXML 并且我设置了一个小的简单测试脚本，它非常适合解析常规元素。我不能为我的狄更斯找到或获得解析具有命名空间的元素的方法。
Here is a small sample test script with code I am using and works great for parsing simple elements. How do I use this to parse namespaces? Everything I've tried doesn't work. I need it to be able to create variables so I can be able to embed them in HTML for style.
这是一个带有我正在使用的代码的小示例测试脚本，非常适合解析简单元素。我如何使用它来解析命名空间？我试过的一切都不起作用。我需要它能够创建变量，以便我能够将它们嵌入到 HTML 中以显示样式。
<?php
$html = "";
// Get the XML Feed
$data = "http://alerts.weather.gov/cap/tx.php?x=1";
// load the xml into the object
$xml = simplexml_load_file($data);
for ($i = 0; $i < 10; $i++){
$title = $xml->entry[$i]->title;
$summary = $xml->entry[$i]->summary;
$html .= "<p><strong>$title</strong></p><p>$summary</p><hr/>";
}
echo $html;
?>
This works fine for parsing regular elements but what about the ones with the cap: namespace under the entry parent?
这适用于解析常规元素，但那些在条目父项下带有 cap: 命名空间的元素呢？
<?php
ini_set('display_errors','1');
$html = "";
$data = "http://alerts.weather.gov/cap/tx.php?x=1";
$entries = simplexml_load_file($data);
if(count($entries)):
//Registering NameSpace
$entries->registerXPathNamespace('prefix', 'http://www.w3.org/2005/Atom');
$result = $entries->xpath("//prefix:entry");
//echo count($asin);
//echo "<pre>";print_r($asin);
foreach ($result as $entry):
$title = $entry->title;
$summary = $entry->summary;
$html .= "<p><strong>$title</strong></p><p>$summary</p>$event<hr/>";
endforeach;
endif;
echo $html;
?>
Any help would be greatly appreciated.
任何帮助将不胜感激。
-Thanks
-谢谢
回答by NullPointer
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
只需要注册Namespace就可以正常使用simplexml_load_file和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.
就是这样。
回答by Rolando Isidoro
Here's an alternative solution:
这是一个替代解决方案：
<?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:
输出：
Event: Fire Weather Watch
Effective: 2013-05-06T23:14:00-05:00
Expires: 2013-05-08T22:00:00-05:00
Severity: Moderate
