(PHP 5 >= 5.1.0, PHP 7, PHP 8)
XMLReader::lookupNamespace — Lookup namespace for a prefix
$prefix
) : string|nullLookup in scope namespace for a given prefix.
prefixString containing the prefix.
The value of the namespace, or null if no namespace exists.
| 版本 | 说明 |
|---|---|
| 8.0.0 |
This function can no longer return false.
|