mirror of
https://github.com/php/doc-zh.git
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580b23e287
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@94824 c90b9560-bf6c-de11-be94-00142212c4b1
89 lines
2.3 KiB
XML
Executable File
89 lines
2.3 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.1 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.4 Maintainer: dallas Status: ready -->
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<refentry id="function.array-flip">
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<refnamediv>
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<refname>array_flip</refname>
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<refpurpose>反转数组中的键和值</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>array_flip</methodname>
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<methodparam><type>array</type><parameter>trans</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_flip</function> 返回一个反转后的 <type>array</type>，例如
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<parameter>trans</parameter> 中的键名变成了值，而
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<parameter>trans</parameter> 中的值成了键名。
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</para>
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<para>
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注意 <parameter>trans</parameter> 中的值需要能够作为合法的键名，例如需要是
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<type>integer</type> 或者 <type>string</type>。如果值的类型不对将发出一个警告，并且有问题的键／值对<emphasis>将不会反转</emphasis>。
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</para>
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<para>
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如果同一个值出现了多次，则最后一个键名将作为它的值，所有其它的都丢失了。
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</para>
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<para>
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<function>array_flip</function> 如果失败返回 &false;。
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</para>
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<para>
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<example>
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<title><function>array_flip</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$trans = array_flip ($trans);
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$original = strtr ($str, $trans);
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>array_flip</function> 例子：冲突</title>
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<programlisting role="php">
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<![CDATA[
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$trans = array ("a" => 1, "b" => 1, "c" => 2);
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$trans = array_flip ($trans);
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print_r($trans);
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]]>
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</programlisting>
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<para>
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现在 $trans 变成了：
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<screen>
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<![CDATA[
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Array
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(
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[1] => b
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[2] => c
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)
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]]>
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</screen>
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</para>
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</example>
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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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