mirror of
https://github.com/php/doc-en.git
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143 lines
3.4 KiB
XML
143 lines
3.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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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>The stdClass class</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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A generic empty class with dynamic properties.
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</para>
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<para>
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Objects of this class can be instantiated with
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<link linkend="language.oop5.basic.new">new</link> operator or created by
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<link linkend="language.types.object.casting">typecasting to object</link>.
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Several PHP functions also create instances of this class, e.g.
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<function>json_decode</function>, <function>mysqli_fetch_object</function>
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or <methodname>PDOStatement::fetchObject</methodname>.
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</para>
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<para>
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Despite not implementing
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<link linkend="object.get">__get()</link>/<link linkend="object.set">__set()</link>
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magic methods, this class allows dynamic properties and does not require the
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<code>#[\AllowDynamicProperties]</code> attribute.
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</para>
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<para>
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This is not a base class as PHP does not have a concept of a universal base
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class. However, it is possible to create a custom class that extends from
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<classname>stdClass</classname> and as a result inherits the functionality
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of dynamic properties.
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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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This class has no methods or default properties.
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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>Created as a result of typecasting to object</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>Created as a result of <function>json_decode</function></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>Declaring dynamic properties</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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