PHP SimpleXML Namespace Problem

Question

I'm trying to get the entry->id and entry->cap:parameter->value for every entry in the RSS feed.... below is the code I'm using. It is displaying the id correctly however it is not displaying the value field.... please help.

$url = 'http://alerts.weather.gov/cap/us.php?x=1';
$cap = simplexml_load_file($url);
foreach($cap->entry as $entry){
    echo 'ID: ', $entry->id, "\n";
    echo 'VTEC: ', $entry->children('cap', true)->parameter->value, "\n"; 
echo "<hr>";
}

Thanks for the help in advance.

can you post a sample of the XML document?

stevevls
– stevevls

2011-05-17 07:14:54 +00:00
Commented May 17, 2011 at 7:14 — stevevls
– stevevls, Commented May 17, 2011 at 7:14

Community · Accepted Answer · 2020-06-20 09:12:55Z

7

The <value> element is not in the same namespace as <cap:parameter>:

<cap:parameter>
    <valueName>VTEC</valueName>
    <value>/O.CON.KMPX.FL.W.0012.000000T0000Z-110517T1800Z/</value>
</cap:parameter>

So you have to call children() again.

Code (demo)

$feed = simplexml_load_file('http://alerts.weather.gov/cap/us.php?x=1');
foreach ($feed->entry as $entry){
    printf(
        "ID: %s\nVTEC: %s\n<hr>",
        $entry->id,
        $entry->children('cap', true)->parameter->children()->value
    );
}

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 17, 2011 at 7:17

Gordon

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8 Comments

Zachary Lassiter Over a year ago

I just tried to run this and its not printing the <value> element. Its outputting ID: alerts.weather.gov/cap/… VTEC: ID: alerts.weather.gov/cap/… .....

Gordon Over a year ago

@Zachary it does what you asked for. See demo link.

Zachary Lassiter Over a year ago

@Gordon... it does not return the $entry->children('cap', true)->parameter->children()->value

Gordon Over a year ago

@Zachary It returns all /feed/entry/id and /feed/entry/cap:parameter/value

Zachary Lassiter Over a year ago

@Gordon... my appologies... I pasted it wrong. Thanks for the help!

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