Gets the namespace prefix of the node based on the namespace URI

# DOMNode::lookupPrefix

(PHP 5, PHP 7, PHP 8)

DOMNode::lookupPrefix — Gets the namespace prefix of the node based on the namespace URI

### Description

public DOMNode::lookupPrefix(string `$namespace`): ?string

Gets the namespace prefix of the node based on the namespace URI.

### Parameters

`namespace`

  The namespace URI.

### Return Values

The prefix of the namespace or `null` on error.

### See Also

- DOMNode::lookupNamespaceUri() - Gets the namespace URI of the node based on the prefix

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