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git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
111 lines
3.6 KiB
XML
Executable File
111 lines
3.6 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.2 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.6 Maintainer: dallas Status: ready -->
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<refentry id="function.each">
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<refnamediv>
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<refname>each</refname>
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<refpurpose>
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返回数组中当前的键／值对并将数组指针向前移动一步
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>说明</title>
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<methodsynopsis>
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<type>array</type><methodname>each</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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返回 <parameter>array</parameter> 数组中当前指针位置的键／值对并向前移动数组指针。键值对被返回为四个单元的数组，键名为
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<emphasis>0</emphasis>，<emphasis>1</emphasis>，<emphasis>key</emphasis>
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和 <emphasis>value</emphasis>。单元 <emphasis>0</emphasis> 和
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<emphasis>key</emphasis> 包含有数组单元的键名，<emphasis>1</emphasis> 和
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<emphasis>value</emphasis> 包含有数据。
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</para>
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<para>
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如果内部指针越过了数组的末端，则 <function>each</function> 返回 &false;。
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</para>
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<para>
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<example>
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<title><function>each</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$foo = array ("bob", "fred", "jussi", "jouni", "egon", "marliese");
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$bar = each ($foo);
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]]>
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</programlisting>
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<para>
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<varname>$bar</varname> 现在包含有如下的键／值对：
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<itemizedlist spacing="compact">
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<listitem><simpara>0 => 0</simpara></listitem>
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<listitem><simpara>1 => 'bob'</simpara></listitem>
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<listitem><simpara>key => 0</simpara></listitem>
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<listitem><simpara>value => 'bob'</simpara></listitem>
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</itemizedlist>
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<programlisting role="php">
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<![CDATA[
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$foo = array ("Robert" => "Bob", "Seppo" => "Sepi");
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$bar = each ($foo);
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]]>
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</programlisting>
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</para>
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<para>
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<varname>$bar</varname> 现在包含有如下的键／值对：
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<itemizedlist spacing="compact">
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<listitem><simpara>0 => 'Robert'</simpara></listitem>
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<listitem><simpara>1 => 'Bob'</simpara></listitem>
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<listitem><simpara>key => 'Robert'</simpara></listitem>
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<listitem><simpara>value => 'Bob'</simpara></listitem>
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</itemizedlist>
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</para>
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</example>
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</para>
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<para>
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<function>each</function> 经常和 <function>list</function>
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结合使用来遍历数组，例如 <varname>$_POST</varname>：
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<example>
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<title>
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用 <function>each</function> 遍历 <varname>$_POST</varname>：
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</title>
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<programlisting role="php">
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<![CDATA[
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echo "Values submitted via POST method:<br />\n";
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reset ($_POST);
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while (list ($key, $val) = each ($_POST)) {
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echo "$key => $val<br />\n";
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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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<para>
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在执行 <function>each</function> 之后，数组指针将停留在数组中的下一个单元或者当碰到数组结尾时停留在最后一个单元。如果要再用 each 遍历数组，必须使用 <function>reset</function>。
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</para>
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<para>
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参见 <function>key</function>，<function>list</function>，<function>current</function>，<function>reset</function>，<function>next</function>，<function>prev</function> 和 <function>foreach</function>。
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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:"../../../../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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