PHP SimpleXMLElement - getDocNamespaces() Method

The PHP SimpleXMLElement::getDocNamespaces() method returns namespaces declared in document.

Syntax

public SimpleXMLElement::getDocNamespaces(recursive, fromRoot)

Parameters

`recursive`	`Optional.` If set to true returns all namespaces declared in parent and child nodes. Otherwise, returns only namespaces declared in root node. Default is false.
`fromRoot`	`Optional.` If set to false, allows recursively check namespaces under a child node instead of from the root of the XML doc. Default is true.

Return Value

Returns an array of namespace names with their associated URIs.

Example: get document namespaces

The example below shows the usage of SimpleXMLElement::getDocNamespaces() method.

<?php
$xmlstr = <<<XML
<userlist xmlns:p="http://example.com/test"> 
  <p:user id="John123">
    <name>John Smith</name>
    <city>New York</city>
    <phone>+1-8054098000</phone>
  </p:user>
  
  <p:user id="Marry2015">
    <name>Marry G.</name>
    <city>London</city>
    <phone>+33-147996101</phone>
  </p:user> 
</userlist> 
XML;

$xml = new SimpleXMLElement($xmlstr);

$namespaces = $xml->getDocNamespaces();
var_dump($namespaces);
?>

The output of the above code will be:

array(1) {
  ["p"]=>
  string(24) "http://example.com/test"
}

Example: working with multiple namespaces

Consider one more example which demonstrates on working with multiple namespaces while using this function.

<?php
$xmlstr = <<<XML
<userlist xmlns:p="http://example.com/test1" xmlns:t="http://example.com/test2"> 
  <p:user id="John123">
    <name>John Smith</name>
    <city>New York</city>
    <phone xmlns:ph="http://example.com/phone">+1-8054098000</phone>
  </p:user>
  
  <t:user id="Marry2015">
    <name>Marry G.</name>
    <city>London</city>
    <phone xmlns:ph="http://example.com/phone">+33-147996101</phone>
  </t:user> 
</userlist> 
XML;

$xml = new SimpleXMLElement($xmlstr);

$namespaces = $xml->getDocNamespaces(true);
var_dump($namespaces);
?>

The output of the above code will be:

array(3) {
  ["p"]=>
  string(24) "http://example.com/test1"
  ["t"]=>
  string(24) "http://example.com/test2"
  ["ph"]=>
  string(24) "http://example.com/phone"
}

❮ PHP SimpleXML Reference