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    DOMNode::insertBefore

    (PHP 5, PHP 7, PHP 8)

    DOMNode::insertBefore — Adiciona um novo filho antes de um nó de referência

    Descrição

    public DOMNode::insertBefore(DOMNode $node, ?DOMNode $child = null): DOMNode|false

    Esta função insere um novo nó imediatamente antes do nó de referência. Se você planeja fazer mais modificações no nó adicionado, deve usar o nó retornado.

    Ao usar um nó existente, ele será movido.

    Parâmetros

    node

    O novo nó.

    child

    O nó de referência. Se não fornecido, node é anexado aos filhos.

    Valor Retornado

    O nó inserido ou false em caso de erro.

    Erros/Exceções

    DOM_NO_MODIFICATION_ALLOWED_ERR

    Gerado se este nó for somente leitura ou se o pai anterior do nó sendo inserido for somente leitura.

    DOM_HIERARCHY_REQUEST_ERR

    Gerado se este nó for de um tipo que não permite filhos do tipo do nó node, ou se o nó a ser anexado for um dos ancestrais deste nó ou este próprio nó.

    DOM_WRONG_DOCUMENT_ERR

    Gerado se node foi criado a partir de um documento diferente daquele que criou este nó.

    DOM_NOT_FOUND

    Gerado se child não for um filho deste nó.

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    User Contributed Notes 5 notes

    up
    7
    Jerry Ellis
    19 years ago
    1st argument) a node to insert
    2nd argument) a reference node - this is the node that the new node will be inserted before

    The trick to using this method is that the OBJECT on which you actually CALL the insertBefore() method is actually the PARENT node of the reference node! 

    INCORRECT:
    $DOMNode_refNode->insertBefore($DOMNode_newNode, $DOMNode_refNode);

    CORRECT:
    $DOMNode_refNode->parentNode->insertBefore($DOMNode_newNode, $DOMNode_refNode);
    up
    5
    jarry1250 at gmail dot com
    9 years ago
    Note that supplying the same node for $newnode and $refnode leads to an E_WARNING ("Couldn't add newnode as the previous sibling of refnode"). For example imagine one wanted to make $newnode the first child of its parent by doing:

    <?php
    $firstSibling     = $newnode->parentNode->firstChild;
    // Bad:
    $newnode->parentNode->insertBefore( $newnode, $firstSibling );
    ?>

    This would generate a warning if it already was the first child of its parent, since $newnode and $firstSibling are identical. Easy to work around though:

    <?php
    $firstSibling     = $newnode->parentNode->firstChild;
    // Better:
    if( $newnode !== $firstSibling ) {
            $newnode->parentNode->insertBefore( $newnode, $firstSibling );
    }
    ?>
    up
    6
    jg at handcode dot de
    19 years ago
    example to insert <newnode/> between <chid1/> and <child2/>

    <?xml version="1.0" encoding="ISO-8859-1" ?>    
    <root>
      <parent>
        <child nr="1"/>
        <child nr="2"/>
      </parent>
    </root>

    <?php

    $xml_src     = 'test.xml';

    // XPath-Querys
    $parent_path = "//parent";
    $next_path = "//parent/child[@nr='2']";

    // Create a new DOM document
    $dom = new DomDocument();
    $dom->load($xml_src);

    // Find the parent node
    $xpath = new DomXPath($dom);

    // Find parent node
    $parent = $xpath->query($parent_path);

    // new node will be inserted before this node
    $next = $xpath->query($next_path);

    // Create the new element
    $element = $dom->createElement('newnode');

    // Insert the new element
    $parent->item(0)->insertBefore($element, $next->item(0));

    echo     $dom->saveXML();

    ?>
    up
    -3
    DrTebi at Yahoo
    17 years ago
    Sorry, my previous posting worked only for the top node. Here the corrected version, which will work for any node:

    XML
    ----
    <?xml version="1.0"?>
    <contacts>
      <person>Adam</person>
      <person>Eva</person>
      <person>Thomas</person>
    </contacts>

    PHP
    ---
    <?php
    // load XML, create XPath object
    $xml = new DomDocument();
    $xml->preserveWhitespace = false;
    $xml->load('contacts.xml');
    $xpath = new DOMXPath($xml);

    // get node eva, which we will append to
    $eva = $xpath->query('/contacts/person[.="Eva"]')->item(0);

    // create node john
    $john = $xml->createElement('person', 'John');

    // insert john after eva
    //   "in eva's parent node (=contacts) insert
    //   john before eva's next node"
    // this also works if eva would be the last node
    $eva->parentNode->insertBefore($john, $eva->nextSibling);

    // show result
    header('Content-Type: text/plain');
    print     $xml->saveXML();
    ?>

    Result
    ------
    <?xml version="1.0"?>
    <contacts>
      <person>Adam</person>
      <person>Eva</person><person>John</person>
      <person>Thomas</person>
    </contacts>
    up
    -5
    justin at redwiredesign dot com
    17 years ago
    The previous example is incorrect, and causes a DOM_NOT_FOUND error, as the child nodes are not direct descendants of the root node.

    Therefore, the line:

    $parent_path = "/root";

    needs to change to:

    $parent_path = "/root/parent";

    or

    $parent_path = "//parent";

    for this example to work
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