Sourabh Sourabh - 2 months ago 11
PHP Question

Unable add namespace with PHPs SimpleXML

I am creating an Atom feed, when I tried below to add

xmlns:i
as an attribute -

$node->addAttribute("xmlns:i","http://www.w3.org/2001/XMLSchema-instance");


I got this as an output -

i="http://www.w3.org/2001/XMLSchema-instance"


"xmlns:"
part was cut off. do I need to escape the
:
-character? Or is they any other way to add this namespace?

Answer

If you want to add an attribute from the namespace/prefix i to $node don't bother declaring the namespace beforehand. Just use the third parameter of addAttribute() to provide the namespace uri for the prefix you're using in the first parameter.

$node = new SimpleXMLElement('<root></root>');
$node->addAttribute("i:somename", "somevalue", 'http://www.w3.org/2001/XMLSchema-instance'); 
echo $node->asXml();

prints

<?xml version="1.0"?>
<root xmlns:i="http://www.w3.org/2001/XMLSchema-instance" i:somename="somevalue"/>

If the attribute itself isn't needed, you can then remove it with unset(), leaving the namespace declaration.

unset($node->attributes('i', TRUE)['somename']);
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