使用XMLWriter跟踪命名空间声明

您可以在文档中的所需位置写下命名空间一次,例如在top元素中:

$writer = new XMLWriter(); 
$writer->openURI('php://output'); 
$writer->startDocument('1.0'); 

$writer->startElement('sample');            
$writer->writeAttributeNS('xmlns','foo', null,'http://foo.org/ns/foo#');
$writer->writeAttributeNS('xmlns','bar', null, 'http://foo.org/ns/bar#');

$writer->writeElementNS('foo','quz', null,'stuff here');
$writer->writeElementNS('bar','quz', null,'stuff there');

$writer->endElement();
$writer->endDocument();
$writer->flush(true);

<?xml version="1.0"?>
<sample xmlns:foo="http://foo.org/ns/foo#" xmlns:bar="http://foo.org/ns/bar#">
 <foo:quz>stuff here</foo:quz>
 <bar:quz>stuff there</bar:quz>
</sample>

有点烦人的是,xmlwriter不跟踪这些声明——它允许您编写无效的xml。这也很烦人,属性是必需的,即使它可以为null,而且这是第三个参数,而不是最后一个。

2c美元,

<?php
$w = new XMLWriter;
$w->openMemory();
$w->setIndent(true);
$w->startElementNS('foo', 'bar', 'http://whatever/foo');
$w->startElementNS('foo', 'baz', null);
$w->endElement();
$w->endElement();
echo $w->outputMemory();

<foo:bar xmlns:foo="http://whatever/foo">
 <foo:baz/>
</foo:bar>