php-doc-en/reference/simplexml/simplexmlelement/asXML.xml

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<refentry xml:id="simplexmlelement.asxml" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>SimpleXMLElement::asXML</refname>
  <refpurpose>
   Return a well-formed XML string based on SimpleXML element
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type class="union"><type>string</type><type>bool</type></type><methodname>SimpleXMLElement::asXML</methodname>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>filename</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   The <literal>asXML</literal> method formats the parent object's data
   in XML version 1.0.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       If a &string; value is provided, the function writes the data to the file rather than
       returning it.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   If the <parameter>filename</parameter> isn't specified, this function
   returns a <type>string</type> on success and &false; on error. If the
   parameter is specified, it returns &true; if the file was written
   successfully and &false; otherwise.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>filename</parameter> is nullable now.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Get XML</title>
    <programlisting role="php">
<![CDATA[
<?php
$string = <<<XML
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
XML;

$xml = new SimpleXMLElement($string);

echo $xml->asXML();

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<?xml version="1.0"?>
<a>
 <b>
  <c>text</c>
  <c>stuff</c>
 </b>
 <d>
  <c>code</c>
 </d>
</a>
]]>
    </screen>
   </example>
  </para>
  <para>
   <literal>asXML</literal> also works on Xpath results:
   <example>
    <title>Using asXML() on <methodname>SimpleXMLElement::xpath</methodname> results</title>
    <programlisting role="php">
<![CDATA[
<?php
// Continued from example XML above.

/* Search for <a><b><c> */
$result = $xml->xpath('/a/b/c');

foreach ($result as $node) {
    echo $node->asXML();
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<c>text</c><c>stuff</c>
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>SimpleXMLElement::__toString</methodname></member>
    <member><xref linkend="simplexml.examples-basic"/></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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