mirror of
https://github.com/sigmasternchen/php-doc-en
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fbde32f84b
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@350305 c90b9560-bf6c-de11-be94-00142212c4b1
150 lines
4.2 KiB
XML
150 lines
4.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.current" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>current</refname>
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<refpurpose>Return the current element in an array</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>mixed</type><methodname>current</methodname>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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Every array has an internal pointer to its "current" element,
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which is initialized to the first element inserted into the
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array.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>array</parameter></term>
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<listitem>
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<para>
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The array.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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The <function>current</function> function simply returns the
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value of the array element that's currently being pointed to by the
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internal pointer. It does not move the pointer in any way. If the
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internal pointer points beyond the end of the elements list or the array is
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empty, <function>current</function> returns &false;.
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</para>
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&return.falseproblem;
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>7.0.0</entry>
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<entry>
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<parameter>array</parameter> is now always passed by value.
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Prior to this version, it was passed by reference if possible,
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and by value otherwise.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Example use of <function>current</function> and friends</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$transport = array('foot', 'bike', 'car', 'plane');
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$mode = current($transport); // $mode = 'foot';
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$mode = next($transport); // $mode = 'bike';
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$mode = current($transport); // $mode = 'bike';
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$mode = prev($transport); // $mode = 'foot';
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$mode = end($transport); // $mode = 'plane';
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$mode = current($transport); // $mode = 'plane';
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$arr = array();
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var_dump(current($arr)); // bool(false)
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$arr = array(array());
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var_dump(current($arr)); // array(0) { }
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<note>
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<simpara>
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The results of calling <function>current</function> on an empty array
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and on an array, whose internal pointer points beyond the end of the elements,
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are indistinguishable from a <type>boolean</type> &false; element.
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To properly traverse an array which may contain &false; elements, see the
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<function>foreach</function> function.
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</simpara>
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<simpara>
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To still use <function>current</function> and properly check if the value
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is really an element of the array, the <function>key</function>
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of the <function>current</function> element should be checked to be strictly
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different from &null;.
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</simpara>
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</note>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>end</function></member>
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<member><function>key</function></member>
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<member><function>each</function></member>
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<member><function>prev</function></member>
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<member><function>reset</function></member>
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<member><function>next</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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