current.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.current" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>current</refname>
  <refpurpose>Return the current element in an array</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>current</methodname>
   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter>array</parameter></methodparam>
  </methodsynopsis>
  <para>
   Every array has an internal pointer to its "current" element,
   which is initialized to the first element inserted into the
   array.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       The array.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The <function>current</function> function simply returns the
   value of the array element that's currently being pointed to by the
   internal pointer.  It does not move the pointer in any way.  If the
   internal pointer points beyond the end of the elements list or the array is 
   empty, <function>current</function> returns &false;.
  </para>
  &return.falseproblem;
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &standard.changelog.calling-on-objects;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Example use of <function>current</function> and friends</title>
    <programlisting role="php">
<![CDATA[
<?php
$transport = array('foot', 'bike', 'car', 'plane');
$mode = current($transport); // $mode = 'foot';
$mode = next($transport);    // $mode = 'bike';
$mode = current($transport); // $mode = 'bike';
$mode = prev($transport);    // $mode = 'foot';
$mode = end($transport);     // $mode = 'plane';
$mode = current($transport); // $mode = 'plane';

$arr = array();
var_dump(current($arr)); // bool(false)

$arr = array(array());
var_dump(current($arr)); // array(0) { }
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    The results of calling <function>current</function> on an empty array
    and on an array, whose internal pointer points beyond the end of the elements,
    are indistinguishable from a <type>bool</type> &false; element. 
    To properly traverse an array which may contain &false; elements, see the 
    &foreach; control structure.
   </simpara>
   <simpara>
    To still use <function>current</function> and properly check if the value 
    is really an element of the array, the <function>key</function> 
    of the <function>current</function> element should be checked to be strictly 
    different from &null;.
   </simpara>
  </note>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>end</function></member>
    <member><function>key</function></member>
    <member><function>each</function></member>
    <member><function>prev</function></member>
    <member><function>reset</function></member>
    <member><function>next</function></member>
    <member>&foreach;</member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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