# DOMNode::replaceChild

(PHP 5, PHP 7, PHP 8)

DOMNode::replaceChild — Replaces a child

### 说明

public DOMNode::replaceChild(DOMNode `$node`, DOMNode `$child`): DOMNode|false

This function replaces the child `child` with the passed new node. If the `node` is already a child it will not be added a second time. If the replacement succeeds the old node is returned.

### 参数

`node`

  The new node. It must be a member of the target document, i.e. created by one of the DOMDocument->createXXX() methods or imported in the document by DOMDocument::importNode.

`child`

  The old node.

### 返回值

The old node or `false` if an error occur.

### 错误／异常

`DOM_NO_MODIFICATION_ALLOWED_ERR`

  Raised if this node is readonly or if the previous parent of the node being inserted is readonly.

`DOM_HIERARCHY_REQUEST_ERR`

  Raised if this node is of a type that does not allow children of the type of the `node` node, or if the node to put in is one of this node's ancestors or this node itself.

`DOM_WRONG_DOCUMENT_ERR`

  Raised if `node` was created from a different document than the one that created this node.

`DOM_NOT_FOUND_ERR`

  Raised if `child` is not a child of this node.

### 参见

- DOMChildNode::replaceWith() - Replaces the node with new nodes
- DOMNode::appendChild() - Adds new child at the end of the children
- DOMNode::removeChild() - Removes child from list of children

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