php-doc-en/reference/domxml/functions/DomNode-replace-child.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id='function.DomNode-replace-child'>
   <refnamediv>
    <refname>DomNode->replace_child</refname>
    <refpurpose>
     Replaces a child
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>object</type><methodname>DomNode->replace_child</methodname>
     <methodparam><type>object</type><parameter>oldnode</parameter></methodparam>
     <methodparam><type>object</type><parameter>newnode</parameter></methodparam>
    </methodsynopsis>
    <para>
     (PHP 4.2) This function replaces the child <parameter>oldnode</parameter>
     with the passed new node. If the new node is already a child it
     will not be added a second time. If the old node cannot be found
     the function returns &false;. If the replacement succeds the old node
     is returned.
    </para>
    <para>
     (PHP 4.3) This function replaces the child <parameter>oldnode</parameter>
     with the passed <parameter>newnode</parameter>, even if the new node already 
     is a child of the DomNode. If <parameter>newnode</parameter> was already 
     inserted in the document it is first unlinked from its existing context.
     If the old node cannot be found the function returns &false;. If the replacement 
     succeds the old node is returned. (This behaviour is according to the W3C specs).
    </para>
    <para>
     See also <function>domnode_append_child</function>
    </para>
   </refsect1>
  </refentry>

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