PHP Manual
SimpleXMLElement
Returns namespaces declared in document

SimpleXMLElement::getDocNamespaces

(PHP 5 >= 5.1.2, PHP 7)

SimpleXMLElement::getDocNamespaces — Returns namespaces declared in document

说明

public SimpleXMLElement::getDocNamespaces ([ bool $recursive = FALSE [, bool $from_root = TRUE ]] ) : array

Returns namespaces declared in document

参数

recursive: If specified, returns all namespaces declared in parent and child nodes. Otherwise, returns only namespaces declared in root node.
from_root: Allows you to recursively check namespaces under a child node instead of from the root of the XML doc.

返回值

The getDocNamespaces method returns an array of namespace names with their associated URIs.

范例

Example #1 Get document namespaces

 <?php

$xml = <<<XML
<?xml version="1.0" standalone="yes"?>
<people xmlns:p="http://example.org/ns">
    <p:person id="1">John Doe</p:person>
    <p:person id="2">Susie Q. Public</p:person>
</people>
XML;
 
$sxe = new SimpleXMLElement($xml);

$namespaces = $sxe->getDocNamespaces();
var_dump($namespaces);

?>

以上例程会输出：

array(1) {
   ["p"]=>
   string(21) "http://example.org/ns"
}

Example #2 Working with multiple namespaces

 <?php

$xml = <<<XML
<?xml version="1.0" standalone="yes"?>
<people xmlns:p="http://example.org/ns" xmlns:t="http://example.org/test">
    <p:person t:id="1">John Doe</p:person>
    <p:person t:id="2" a:addr="123 Street" xmlns:a="http://example.org/addr">
        Susie Q. Public
    </p:person>
</people>
XML;
 
$sxe = new SimpleXMLElement($xml);

$namespaces = $sxe->getDocNamespaces(TRUE);
var_dump($namespaces);

?>

以上例程会输出：

array(3) {
  ["p"]=>
  string(21) "http://example.org/ns"
  ["t"]=>
  string(23) "http://example.org/test"
  ["a"]=>
  string(23) "http://example.org/addr"
}

更新日志

版本	说明
5.4.0	Added `from_root` parameter.

参见

SimpleXMLElement::getNamespaces() - Returns namespaces used in document
SimpleXMLElement::registerXPathNamespace() - Creates a prefix/ns context for the next XPath query