mirror of
https://github.com/php/doc-zh.git
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Dallas Wang
64071f2fba
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
140 lines
3.3 KiB
XML
Executable File
140 lines
3.3 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.list">
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<refnamediv>
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<refname>list</refname>
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<refpurpose>
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把数组中的值赋给一些变量
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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>void</type><methodname>list</methodname>
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<methodparam rep="repeat"><type>mixed</type><parameter>...</parameter></methodparam>
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</methodsynopsis>
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<para>
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像 <function>array</function> 一样，这不是真正的函数，而是语言结构。<function>list</function>
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用一步操作给一组变量进行赋值。
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</para>
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<note>
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<para>
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<function>list</function> 仅能用于数字索引的数组并假定数字索引从 0 开始。
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</para>
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</note>
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<para>
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<example>
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<title><function>list</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$info = array('coffee', 'brown', 'caffeine');
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// Listing all the variables
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list($drink, $color, $power) = $info;
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print "$drink is $color and $power makes it special.\n";
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// Listing some of them
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list($drink, , $power) = $info;
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print "$drink has $power.\n";
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// Or let's skip to only the third one
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list( , , $power) = $info;
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print "I need $power!\n";
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>使用 <function>list</function> 的例子</title>
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<programlisting role="php">
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<![CDATA[
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<table>
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<tr>
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<th>Employee name</th>
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<th>Salary</th>
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</tr>
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<?php
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$result = mysql_query ("SELECT id, name, salary FROM employees",$conn);
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while (list ($id, $name, $salary) = mysql_fetch_row ($result)) {
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print (" <tr>\n".
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" <td><a href=\"info.php?id=$id\">$name</a></td>\n".
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" <td>$salary</td>\n".
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" </tr>\n");
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}
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?>
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</table>
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]]>
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</programlisting>
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</example>
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</para>
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<warning>
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<para>
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<function>list</function> 从最右边一个参数开始赋值。如果你用单纯的变量，不用担心这一点。但是如果你用了具有索引的数组，通常你期望得到的结果和在
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<function>list</function> 中写的一样是从左到右的，但实际上不是。是以相反顺序赋值的。
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</para>
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</warning>
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<para>
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<example>
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<title>在 <function>list</function> 中使用数组索引</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$info = array('coffee', 'brown', 'caffeine');
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list($a[0], $a[1], $a[2]) = $info;
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var_dump($a);
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]]>
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</programlisting>
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</example>
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产生如下输出（注意单元顺序和 <function>list</function> 语法中所写的顺序的比较）：
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<screen>
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array(3) {
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[2]=>
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string(8) "caffeine"
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[1]=>
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string(5) "brown"
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[0]=>
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string(6) "coffee"
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}
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</screen>
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</para>
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<para>
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参见 <function>each</function>，<function>array</function> 和 <function>extract</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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