XMLReader::lookupNamespace

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

XMLReader::lookupNamespace — Lookup namespace for a prefix

public function XMLReader::lookupNamespace(string $prefix): ?string

Lookup in scope namespace for a given prefix.

The value of the namespace, or null if no namespace exists.

Version	Description
8.0.0	This function can no longer return `false`.