ZEND PHP 5 Certification STUDY GUIDE

XML and Web Services ” 197
Since PHP 5.1.3, SimpleXML has had the ability to return all namespaces declared
in a document, return all namespaces used in a document, and register a
namespace prefix used in making an XPath query. The first of these features is
SimpleXMLElement::getDocNamespaces(), which returns an array of all namespaces
declared in the document. By default, it returns only those namespaces declared
in the root element referenced by the SimpleXMLElement object, but passing true to
the method will cause it to behave recursively and return the namespaces declared
in all children. Since our sample XML document declares four namespaces in the
root element of the document, getDocNamespaces() returns four namespaces:
$namespaces = $library->getDocNamespaces();
foreach ($namespaces as $key => $value)
{
echo "{$key} => {$value}\n";
}
Notice that the foo namespace was listed, but was never actually used. A
call to SimpleXMLElement::getNamespaces() will return an array that only contains
those namespaces that are actually used throughout the document. Like
getDocNamespaces(), this method accepts a boolean value to turn on its recursive behaviour.
$namespaces = $library->getNamespaces(true);
foreach ($namespaces as $key => $value)
{
echo "{$key} => {$value}\n";
}
DOM
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
The PHP 5 DOM extension sounds similar to the PHP 4 DOMXML extension, but it
has undergone a complete transformation and is easier to use. Unlike SimpleXML,
DOM can, at times, be cumbersome and unwieldy. However, this is a trade-off for
the power and flexibility it provides. Since SimpleXML and DOM objects are inter-