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140 lines
4.0 KiB
XML
Executable File
140 lines
4.0 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 2e60c5134e7a847c99f81eb3f7ecee1f5efeeace Maintainer: avenger Status: ready -->
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<!-- CREDITS: mowangjuanzi -->
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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>返回数组中的当前值</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 class="union"><type>array</type><type>object</type></type><parameter>array</parameter></methodparam>
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</methodsynopsis>
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<para>
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每个数组中都有一个内部的指针指向它“当前的”单元，初始化时会指向该数组中的第一个值。
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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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要操作的数组。
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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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<function>current</function>
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函数返回当前被内部指针指向的数组单元的值，并不移动指针。如果内部指针指向超出了单元列表的末端，<function>current</function>
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将返回 &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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<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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&standard.changelog.calling-on-objects;
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</tbody>
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</tgroup>
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</informaltable>
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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> <function>current</function> 函数使用示例</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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echo $mode = current($transport), PHP_EOL; // $mode = 'foot';
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echo $mode = next($transport), PHP_EOL; // $mode = 'bike';
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echo $mode = current($transport), PHP_EOL; // $mode = 'bike';
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echo $mode = prev($transport), PHP_EOL; // $mode = 'foot';
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echo $mode = end($transport), PHP_EOL; // $mode = 'plane';
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echo $mode = current($transport), PHP_EOL; // $mode = 'plane';
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$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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在一个空数组上使用 <function>current</function>
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函数，和在一个内部指针指向单元末端以外的数组上使用此函数，结果是相同的，同样都会返回
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<type>bool</type> &false;。如果希望正确遍历一个包含 &false; 的数组，请参阅
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&foreach; 控制结构。
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</simpara>
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<simpara>
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如果仍然希望使用 <function>current</function> 来判断数组单元真实的值，应该同时使用
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<function>key</function> 和 <function>current</function>
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来检查当前元素是否为 &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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<member>&foreach;</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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