PHP Manual: Create start namespaced attribute

Object-oriented style

public bool XMLWriter::startAttributeNs(stringnull $prefix, string $name, stringnull $namespace)

Procedural style

bool xmlwriter_start_attribute_ns(
    XMLWriter $writer,
    stringnull $prefix,
    string $name,
    stringnull $namespace
)

Starts a namespaced attribute.

writer: Only for procedural calls. The XMLWriter instance that is being modified. This object is returned from a call to xmlwriter_open_uri or xmlwriter_open_memory.
prefix: The namespace prefix.
name: The attribute name.
namespace: The namespace URI. If namespace is null, the namespace declaration will be omitted.

Returns true on success or false on failure.

Version	Description
8.0.0	`writer` expects an XMLWriter instance now; previously, a resource was expected.
8.0.0	`prefix` is nullable now.

XMLWriter::startAttributeNs