Adds new attribute node to element

# DOMElement::setAttributeNodeNS

(PHP 5, PHP 7, PHP 8)

DOMElement::setAttributeNodeNS — Adds new attribute node to element

### 说明

public function DOMElement::setAttributeNodeNS(DOMAttr `$attr`): DOMAttr|null|false

Adds new attribute node `attr` to element, keeping the namespace into account. If an attribute with the same name already exists on the element, that attribute is replaced by `attr`.

### 参数

`attr`

  The attribute node.

### 返回值

Returns the old attribute if it has been replaced or `null` if there was no old attribute. If a `DOM_WRONG_DOCUMENT_ERR` error is raised, and strictErrorChecking is `false`, `false` is returned.

### 错误／异常

May throw a DOMException with the following error codes:

`DOM_WRONG_DOCUMENT_ERR`

  Raised if `attr` belongs to a different document than the element.

### 参见

- DOMElement::hasAttributeNS() - Checks to see if attribute exists
- DOMElement::getAttributeNodeNS() - Returns attribute node
- DOMElement::removeAttributeNode() - Removes attribute

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