mirror of
https://github.com/php/doc-zh.git
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142 lines
3.4 KiB
XML
142 lines
3.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 77325b622f91355b118e8f3bc9ff940e8201f55d Maintainer: mowangjuanzi Status: ready -->
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<!-- CREDITS: Luffy -->
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<reference xml:id="class.stdclass" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
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<title>stdClass 类</title>
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<titleabbrev>stdClass</titleabbrev>
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<partintro>
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<section xml:id="stdclass.intro">
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&reftitle.intro;
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<para>
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具有动态属性的通用空类。
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</para>
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<para>
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此类的对象可以使用 <link linkend="language.oop5.basic.new">new</link>
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运算符实例化，也可以通过<link
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linkend="language.types.object.casting">类型转换为对象</link>创建。几个
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PHP 函数也会创建此类的实例，比如
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<function>json_decode</function>、<function>mysqli_fetch_object</function>
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或 <methodname>PDOStatement::fetchObject</methodname>。
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</para>
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<para>
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尽管没有实现 <link linkend="object.get">__get()</link>/<link
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linkend="object.set">__set()</link> 魔术方法，但此类允许动态属性且不需要
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<code>#[\AllowDynamicProperties]</code> 属性。
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</para>
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<para>
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这不是 PHP 的基类，因为 PHP 没有通用基类的概念。然而，可以创建继承
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<classname>stdClass</classname> 的自定义类，从而继承动态属性的功能。
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</para>
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</section>
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<section xml:id="stdclass.synopsis">
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&reftitle.classsynopsis;
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<classsynopsis class="class">
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<ooclass>
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<modifier role="attribute">#[\AllowDynamicProperties]</modifier>
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<classname>stdClass</classname>
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</ooclass>
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</classsynopsis>
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<para>
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此类没有方法和默认属性。
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</para>
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</section>
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<section xml:id="stdclass.examples" role="examples">
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&reftitle.examples;
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<example xml:id="stdclass.basic-example">
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<title>通过类型转换为对象创建</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$obj = (object) array('foo' => 'bar');
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var_dump($obj);
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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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object(stdClass)#1 (1) {
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["foo"]=>
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string(3) "bar"
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}
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]]>
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</screen>
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</example>
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<example xml:id="stdclass.json-example">
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<title>通过 <function>json_decode</function> 创建</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$json = '{"foo":"bar"}';
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var_dump(json_decode($json));
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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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object(stdClass)#1 (1) {
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["foo"]=>
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string(3) "bar"
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}
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]]>
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</screen>
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</example>
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<example xml:id="stdclass.properties-example">
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<title>声明动态属性</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$obj = new stdClass();
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$obj->foo = 42;
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$obj->{1} = 42;
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var_dump($obj);
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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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object(stdClass)#1 (2) {
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["foo"]=>
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int(42)
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["1"]=>
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int(42)
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}
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]]>
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</screen>
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</example>
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</section>
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</partintro>
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</reference>
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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:"~/.phpdoc/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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