mirror of
https://github.com/php/doc-zh.git
synced 2026-04-24 00:28:08 +02:00
Dallas Wang
2ed9da711d
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@194648 c90b9560-bf6c-de11-be94-00142212c4b1
89 lines
2.9 KiB
XML
Executable File
89 lines
2.9 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
|
||
<!-- $Revision: 1.1 $ -->
|
||
<!-- $Author: dallas $ -->
|
||
<!-- EN-Revision: 1.2 Maintainer: dallas Status: ready -->
|
||
<refentry id="function.array-diff-key">
|
||
<refnamediv>
|
||
<refname>array_diff_key</refname>
|
||
<refpurpose>使用键名比较计算数组的差集</refpurpose>
|
||
</refnamediv>
|
||
<refsect1>
|
||
<title>说明</title>
|
||
<methodsynopsis>
|
||
<type>array</type><methodname>array_diff_key</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_key</function> 返回一个数组，该数组包括了所有出现在
|
||
<parameter>array1</parameter>
|
||
中但是未出现在任何其它参数数组中的键名的值。注意关联关系保留不变。本函数和
|
||
<function>array_diff</function> 相同只除了比较是根据键名而不是值来进行的。
|
||
</para>
|
||
<para>
|
||
<example>
|
||
<title><function>array_diff_key</function> 例子</title>
|
||
<programlisting role="php">
|
||
<![CDATA[
|
||
<?php
|
||
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
|
||
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
|
||
|
||
var_dump(array_diff_key($array1, $array2));
|
||
?>
|
||
]]>
|
||
</programlisting>
|
||
&example.outputs;
|
||
<screen>
|
||
<![CDATA[
|
||
array(2) {
|
||
["red"]=>
|
||
int(2)
|
||
["purple"]=>
|
||
int(4)
|
||
}
|
||
]]>
|
||
</screen>
|
||
</example>
|
||
</para>
|
||
<simpara>
|
||
在 <literal>key => value</literal> 对中的两个键名仅在
|
||
<literal>(string) $key1 === (string) $key2 </literal>
|
||
时被认为相等。换句话说，执行的是严格类型检查，因此字符串的表达必须完全一样。
|
||
</simpara>
|
||
<note>
|
||
<simpara>
|
||
注意本函数只检查了多维数组中的一维。当然，可以用
|
||
<literal>array_diff_key($array1[0], $array2[0]);</literal>
|
||
来检查更深的维度。
|
||
</simpara>
|
||
</note>
|
||
<para>
|
||
参见 <function>array_diff</function>，<function>array_udiff</function>，<function>array_diff_assoc</function>，<function>array_diff_uassoc</function>，<function>array_udiff_assoc</function>，<function>array_udiff_uassoc</function>，<function>array_diff_ukey</function>，<function>array_intersect</function>，<function>array_intersect_assoc</function>，<function>array_intersect_uassoc</function>，<function>array_intersect_key</function>
|
||
和 <function>array_intersect_ukey</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
|
||
-->
|