php-doc-en/reference/domxml/functions/DomNode-set-namespace.xml

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  <refentry id='function.domnode-set-namespace'>
   <refnamediv>
    <refname>DomNode->set_namespace</refname>
    <refpurpose>
     Sets namespace of a node.
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>void</type><methodname>DomNode->set_namespace</methodname>
     <methodparam><type>string</type><parameter>uri</parameter></methodparam>
     <methodparam choice="opt"><type>string</type><parameter>prefix</parameter></methodparam>
    </methodsynopsis>
    <para>
    Sets the namespace of a node to <parameter>uri</parameter>.
    If there is already a namespace declaration with the same uri in one of the parent nodes
    of the node, the prefix of this is taken, otherwise it will take the one provided 
    in the optional parameter <parameter>prefix</parameter> or generate a random one.
    </para>
    <para>
     See also <function>domdocument_create_element_ns</function>, and
     <function>domnode_add_namespace</function>
    </para>
   </refsect1>
  </refentry>

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