reset.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.reset" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>reset</refname>
  <refpurpose>Set the internal pointer of an array to its first element</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>reset</methodname>
   <methodparam><type class="union"><type>array</type><type>object</type></type><parameter role="reference">array</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>reset</function> rewinds <parameter>array</parameter>'s internal
   pointer to the first element and returns the value of the first array
   element.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       The input array.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the value of the first array element, or &false; if the array is
   empty.
  </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><function>reset</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

$array = array('step one', 'step two', 'step three', 'step four');

// by default, the pointer is on the first element
echo current($array) . "<br />\n"; // "step one"

// skip two steps
next($array);
next($array);
echo current($array) . "<br />\n"; // "step three"

// reset pointer, start again on step one
reset($array);
echo current($array) . "<br />\n"; // "step one"

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    The return value for an empty array is indistinguishable from 
    the return value in case of an array which has a <type>bool</type> &false; 
    first element. To properly check the value of the first element of an array
    which may contain &false; elements, first check the <function>count</function>
    of the array, or check that <function>key</function> is not
    &null;, after calling <function>reset</function>.
   </simpara>
  </note>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>current</function></member>
    <member><function>each</function></member>
    <member><function>end</function></member>
    <member><function>next</function></member>
    <member><function>prev</function></member>
    <member><function>array_key_first</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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