php-doc-en/reference/dom/functions/dom-domnode-replacechild.xml

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<refentry xml:id='function.dom-domnode-replacechild' xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>DOMNode->replaceChild()</refname>
  <refpurpose>
   Replaces a child
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <classsynopsis>
   <ooclass><classname>DOMNode</classname></ooclass>
   <methodsynopsis>
    <type>DOMNode</type><methodname>replaceChild</methodname>
    <methodparam><type>DOMNode</type><parameter>newnode</parameter></methodparam>
    <methodparam><type>DOMNode</type><parameter>oldnode</parameter></methodparam>
   </methodsynopsis>
  </classsynopsis>
  <para>
   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 replacement succeeds the 
   old node is returned.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>newnode</parameter></term>
     <listitem>
      <para>
       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 <xref linkend='function.dom-domdocument-importnode' />.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>oldnode</parameter></term>
     <listitem>
      <para>
       The old node.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The old node or &false; if an error occur.
  </para>
 </refsect1>
 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   <variablelist>
    <varlistentry>
     <term><constant>DOM_NO_MODIFICATION_ALLOWED_ERR</constant></term>
     <listitem>
      <para>
       Raised if this node is readonly or if the previous parent of the node
       being inserted is readonly.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><constant>DOM_HIERARCHY_REQUEST_ERR</constant></term>
     <listitem>
      <para>
       Raised if this node is of a type that does not allow children of the 
       type of the <parameter>newnode</parameter> node, or if the node to 
       put in is one of this node's ancestors or this node itself.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><constant>DOM_WRONG_DOCUMENT_ERR</constant></term>
     <listitem>
      <para>
       Raised if <parameter>newnode</parameter> was created from a different 
       document than the one that created this node.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><constant>DOM_NOT_FOUND</constant></term>
     <listitem>
      <para>
       Raised if <parameter>oldnode</parameter> is not a child of this node.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><xref linkend="function.dom-domnode-appendchild" /></member>
    <member><xref linkend="function.dom-domnode-removechild" /></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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