mirror of
https://github.com/php/doc-zh.git
synced 2026-03-25 15:42:15 +01:00
2ed9da711d
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@194648 c90b9560-bf6c-de11-be94-00142212c4b1
96 lines
2.5 KiB
XML
Executable File
96 lines
2.5 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
|
||
<!-- $Revision: 1.6 $ -->
|
||
<!-- $Author: dallas $ -->
|
||
<!-- EN-Revision: 1.11 Maintainer: dallas Status: ready -->
|
||
<refentry id="function.array-diff">
|
||
<refnamediv>
|
||
<refname>array_diff</refname>
|
||
<refpurpose>计算数组的差集</refpurpose>
|
||
</refnamediv>
|
||
<refsect1>
|
||
<title>说明</title>
|
||
<methodsynopsis>
|
||
<type>array</type><methodname>array_diff</methodname>
|
||
<methodparam><type>array</type><parameter>array1</parameter></methodparam>
|
||
<methodparam><type>array</type><parameter>array2</parameter></methodparam>
|
||
<methodparam choice="opt"><type>array</type><parameter> ...</parameter></methodparam>
|
||
</methodsynopsis>
|
||
<para>
|
||
<function>array_diff</function> 返回一个数组，该数组包括了所有在
|
||
<parameter>array1</parameter> 中但是不在任何其它参数数组中的值。注意键名保留不变。
|
||
</para>
|
||
<para>
|
||
<example>
|
||
<title><function>array_diff</function> 例子</title>
|
||
<programlisting role="php">
|
||
<![CDATA[
|
||
<?php
|
||
$array1 = array("a" => "green", "red", "blue", "red");
|
||
$array2 = array("b" => "green", "yellow", "red");
|
||
$result = array_diff($array1, $array2);
|
||
|
||
print_r($result);
|
||
?>
|
||
]]>
|
||
</programlisting>
|
||
<para>
|
||
在 $array1 中多次出现的值一样处理，输出结果为：
|
||
</para>
|
||
<screen>
|
||
<![CDATA[
|
||
Array
|
||
(
|
||
[1] => blue
|
||
)
|
||
]]>
|
||
</screen>
|
||
</example>
|
||
</para>
|
||
<note>
|
||
<simpara>
|
||
两个单元仅在 <literal>(string) $elem1 === (string) $elem2</literal>
|
||
时被认为是相同的。也就是说，当字符串的表达是一样的时候。
|
||
<!-- TODO: example of it... -->
|
||
</simpara>
|
||
</note>
|
||
<note>
|
||
<simpara>
|
||
注意本函数只检查了多维数组中的一维。当然可以用
|
||
<literal>array_diff($array1[0], $array2[0]);</literal>
|
||
检查更深的维度。
|
||
</simpara>
|
||
</note>
|
||
<warning>
|
||
<simpara>
|
||
本函数在 PHP 4.0.4 中是坏的！
|
||
<!-- TODO: when exactly was this broken?... -->
|
||
</simpara>
|
||
</warning>
|
||
<para>
|
||
参见 <function>array_diff_assoc</function>，<function>array_intersect</function> 和
|
||
<function>array_intersect_assoc</function>。
|
||
</para>
|
||
</refsect1>
|
||
</refentry>
|
||
|
||
<!-- Keep this comment at the end of the file
|
||
Local variables:
|
||
mode: sgml
|
||
sgml-omittag:t
|
||
sgml-shorttag:t
|
||
sgml-minimize-attributes:nil
|
||
sgml-always-quote-attributes:t
|
||
sgml-indent-step:1
|
||
sgml-indent-data:t
|
||
indent-tabs-mode:nil
|
||
sgml-parent-document:nil
|
||
sgml-default-dtd-file:"../../../../manual.ced"
|
||
sgml-exposed-tags:nil
|
||
sgml-local-catalogs:nil
|
||
sgml-local-ecat-files:nil
|
||
End:
|
||
vim600: syn=xml fen fdm=syntax fdl=2 si
|
||
vim: et tw=78 syn=sgml
|
||
vi: ts=1 sw=1
|
||
-->
|