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stdclass.xml
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141 lines (129 loc) · 3.4 KB
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 77325b622f91355b118e8f3bc9ff940e8201f55d Maintainer: mowangjuanzi Status: ready -->
<!-- CREDITS: Luffy -->
<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">
<title>stdClass 类</title>
<titleabbrev>stdClass</titleabbrev>
<partintro>
<section xml:id="stdclass.intro">
&reftitle.intro;
<para>
具有动态属性的通用空类。
</para>
<para>
此类的对象可以使用 <link linkend="language.oop5.basic.new">new</link>
运算符实例化，也可以通过<link
linkend="language.types.object.casting">类型转换为对象</link>创建。几个
PHP 函数也会创建此类的实例，比如
<function>json_decode</function>、<function>mysqli_fetch_object</function>
或 <methodname>PDOStatement::fetchObject</methodname>。
</para>
<para>
尽管没有实现 <link linkend="object.get">__get()</link>/<link
linkend="object.set">__set()</link> 魔术方法，但此类允许动态属性且不需要
<code>#[\AllowDynamicProperties]</code> 属性。
</para>
<para>
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
<classname>stdClass</classname> 的自定义类，从而继承动态属性的功能。
</para>
</section>
<section xml:id="stdclass.synopsis">
&reftitle.classsynopsis;
<classsynopsis class="class">
<ooclass>
<modifier role="attribute">#[\AllowDynamicProperties]</modifier>
<classname>stdClass</classname>
</ooclass>
</classsynopsis>
<para>
此类没有方法和默认属性。
</para>
</section>
<section xml:id="stdclass.examples" role="examples">
&reftitle.examples;
<example xml:id="stdclass.basic-example">
<title>通过类型转换为对象创建</title>
<programlisting role="php">
<![CDATA[
<?php
$obj = (object) array('foo' => 'bar');
var_dump($obj);
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(stdClass)#1 (1) {
["foo"]=>
string(3) "bar"
}
]]>
</screen>
</example>
<example xml:id="stdclass.json-example">
<title>通过 <function>json_decode</function> 创建</title>
<programlisting role="php">
<![CDATA[
<?php
$json = '{"foo":"bar"}';
var_dump(json_decode($json));
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(stdClass)#1 (1) {
["foo"]=>
string(3) "bar"
}
]]>
</screen>
</example>
<example xml:id="stdclass.properties-example">
<title>声明动态属性</title>
<programlisting role="php">
<![CDATA[
<?php
$obj = new stdClass();
$obj->foo = 42;
$obj->{1} = 42;
var_dump($obj);
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
object(stdClass)#1 (2) {
["foo"]=>
int(42)
["1"]=>
int(42)
}
]]>
</screen>
</example>
</section>
</partintro>
</reference>
<!-- 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:"~/.phpdoc/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
-->