mirror of
https://github.com/php/doc-zh.git
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Dallas Wang
48dfd2c071
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@194858 c90b9560-bf6c-de11-be94-00142212c4b1
94 lines
2.7 KiB
XML
94 lines
2.7 KiB
XML
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.5 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.5 Maintainer: dallas Status: ready -->
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<refentry id="function.array-diff-assoc">
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<refnamediv>
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<refname>array_diff_assoc</refname>
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<refpurpose>带索引检查计算数组的差集</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_diff_assoc</methodname>
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<methodparam><type>array</type><parameter>array1</parameter></methodparam>
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<methodparam><type>array</type><parameter>array2</parameter></methodparam>
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<methodparam choice="opt"><type>array</type><parameter> ...</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>array_diff_assoc</function> 返回一个数组，该数组包括了所有在
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<parameter>array1</parameter> 中但是不在任何其它参数数组中的值。注意和
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<function>array_diff</function> 不同的是键名也用于比较。
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</para>
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<para>
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<example>
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<title><function>array_diff_assoc</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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$array1 = array ("a" => "green", "b" => "brown", "c" => "blue", "red");
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$array2 = array ("a" => "green", "yellow", "red");
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$result = array_diff_assoc($array1, $array2);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Array
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(
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[b] => brown
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[c] => blue
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[0] => red
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)
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]]>
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</screen>
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</example>
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</para>
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<simpara>
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上面的例子中可以看到键值对 <literal>"a" => "green"</literal>
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在两个数组中都有，因此不在本函数的输出中。与此不同，键值对
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<literal>0 => "red"</literal> 出现在输出中是因为第二个参数中的
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<literal>"red"</literal> 的键名是 <literal>1</literal>。
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</simpara>
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<simpara>
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键值对 <emphasis>key => value</emphasis>
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中的两个值仅在 <literal>(string) $elem1 === (string)
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$elem2 </literal> 时被认为相等。也就是说使用了严格检查，字符串的表达必须相同。
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<!-- TODO: example of it... -->
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</simpara>
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<note>
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<simpara>
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注意本函数只检查了多维数组中的一维。当然可以用
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<literal>array_diff_assoc($array1[0], $array2[0]);</literal>
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检查更深的维度。
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</simpara>
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</note>
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<para>
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参见 <function>array_diff</function>，<function>array_intersect</function>
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和 <function>array_intersect_assoc</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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