CODEWITHSUNDEEP
phpxmlxpath
Rodolfo BocaneGra
Rodolfo BocaneGra

Reputation: 357

How to write a correct XPath for an XML on php?

I'm creating a simple web app to print some information contained on an XML test file using XPath. I show below this XML file (I've pointed some important values mentioned later):

XML File

This app is already capable to print some values, for example, if I want to print the green marked value on the screen capture I do this:

foreach ($xml->xpath('//cfdi:Comprobante//cfdi:Emisor') as $emisor){
    echo("Emisor = ".$emisor['nombre']);
}

Which prints "Emisor = PHARMA PLUS SA DE CV" that it's OK, after that, I want to print the red marked valued called "UUID" and I do this:

foreach ($xml->xpath('//cfdi:Comprobante//cfdi:Complemento//tfd:TimbreFiscalDigital') as 
$tfd){
    echo("UUID = ".$tfd['UUID']);
}

Which gives me this message: SimpleXMLElement::xpath(): Undefined namespace prefix in /storage/ssd3...prueba4.php on line 46

I'm starting to use XML and php, would you help me to write the correct XPath please? Thanks in advance.

The XML file is: here

Upvotes: 0

Views: 196

Answers (1)

Nigel Ren
Nigel Ren

Reputation: 57121

When using a namespace in XPath, you should register it with the (in SimpleXML's case) document using registerXPathNamespace().

So...

$xml->registerXPathNamespace("tfd", "http://www.sat.gob.mx/TimbreFiscalDigital");
foreach ($xml->xpath('//cfdi:Comprobante//cfdi:Complemento//tfd:TimbreFiscalDigital') as
        $tfd){
            echo("UUID = ".$tfd['UUID']).PHP_EOL;
}

Gives...

UUID = ad662d33-6934-459c-a128-bdf0393e0f44

Upvotes: 2

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