PHP Manual
DOMNode
Adds a new child before a reference node

DOMNode::insertBefore

(PHP 5, PHP 7)

DOMNode::insertBefore — Adds a new child before a reference node

说明

public DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] ) : DOMNode

This function inserts a new node right before the reference node. If you plan to do further modifications on the appended child you must use the returned node.

参数

newnode: The new node.
refnode: The reference node. If not supplied, newnode is appended to the children.

返回值

The inserted node.

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 newnode node, or if the node to append is one of this node's ancestors or this node itself.
DOM_WRONG_DOCUMENT_ERR: Raised if newnode was created from a different document than the one that created this node.
DOM_NOT_FOUND: Raised if refnode is not a child of this node.

参见

DOMNode::appendChild() - Adds new child at the end of the children

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