PHP用正确的名称空间和模式位置编写XML

Question

I am writing XML using XMLWriter. I've been able to create

<foo xmlns="https://www.example.com" id="1" name="test" />

With:

$w=new XMLWriter();
$w->openMemory();
$w->startDocument('1.0','UTF-8');
$w->startElementNS(null, "foo", "https://www.example.com");
$w->writeAttribute("id", 1);
$w->writeAttribute("name", "test");
$w->endDocument();
return $w->outputMemory(true);

However, what I need is to add xsi and xsi:schemaLocation, such as:

<foo xmlns="https://www.example.com" id="1" name="test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://www.example.com/myschema.xsd" />

I tried using this code:

$w->writeAttributeNS("xmlns","xsi", "http://www.w3.org/2001/XMLSchema-instance", "http://www.w3.org/2001/XMLSchema-instance");

But then I end up with:

<foo xmlns="https://www.example.com" id="1" name="test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xmlns="http://www.w3.org/2001/XMLSchema-instance" />

Which isn't valid, nor is it what I need.

Answer 1

I figured it out, just use writeAttribute instead of writeAttributeNS .

$w->writeAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
$w->writeAttribute("xsi:schemaLocation", "https://www.example.com/myschema.xsd");