Руководство по PHP
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# DOMNode->insertBefore()

DOMNode->insertBefore() -- Adds a new child before a reference node

## Описание

class DOMNode {
DOMNode insertBefore ( DOMNode newnode [, DOMNode refnode] )
}

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.

## Список параметров

newnode

  The new node.

refnode

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

## Возвращаемые значения

The inserted node.

## Исключения

`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.

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DOMNode->hasChildNodes() | Уровень выше | DOMNode->isSameNode()