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

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  <refentry id='function.dom-domnode-replacechild'>
   <refnamediv>
    <refname>DOMNode->replaceChild</refname>
    <refpurpose>
     Replaces a child
    </refpurpose>
   </refnamediv>
   <refsect1>
    &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>
    <para> 
     Throws <classname>DOMException</classname> if node cannot be replaced.
    </para>
   </refsect1>
  </refentry>

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