php-doc-en/reference/simplexml/simplexmliterator/valid.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="simplexmliterator.valid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>SimpleXMLIterator::valid</refname>
  <refpurpose>Check whether the current element is valid</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>bool</type><methodname>SimpleXMLIterator::valid</methodname>
   <void/>
  </methodsynopsis>
  <para>
   This method checks if the current element is valid after calls to
   <methodname>SimpleXMLIterator::rewind</methodname> or
   <methodname>SimpleXMLIterator::next</methodname>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if the current element is valid, otherwise &false;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Check whether the current element is valid</title>
    <programlisting role="php">
<![CDATA[
<?php
$xmlIterator = new SimpleXMLIterator('<books><book>SQL Basics</book></books>');

$xmlIterator->rewind(); // rewind to the first element
echo var_dump($xmlIterator->valid()); // bool(true)

$xmlIterator->next(); // advance to the next element
echo var_dump($xmlIterator->valid()); // bool(false) because there is only one element
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

</refentry>

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