mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-15 08:28:54 +00:00
105 lines
2.8 KiB
XML
105 lines
2.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<phpdoc:classref xml:id="class.weakreference" xmlns:phpdoc="http://php.net/ns/phpdoc" 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 WeakReference class</title>
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<titleabbrev>WeakReference</titleabbrev>
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<partintro>
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<!-- {{{ WeakReference intro -->
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<section xml:id="weakreference.intro">
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&reftitle.intro;
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<para>
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Weak references allow the programmer to retain a reference to an object which does not prevent
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the object from being destroyed. They are useful for implementing cache like structures.
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</para>
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<para>
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<classname>WeakReference</classname>s cannot be serialized.
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</para>
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</section>
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<!-- }}} -->
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<section xml:id="weakreference.synopsis">
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&reftitle.classsynopsis;
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<!-- {{{ Synopsis -->
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<classsynopsis>
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<ooclass>
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<classname>WeakReference</classname>
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</ooclass>
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<classsynopsisinfo>
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<ooclass>
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<modifier>final</modifier>
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<classname>WeakReference</classname>
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</ooclass>
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</classsynopsisinfo>
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<classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.weakreference')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[not(@role='procedural')])">
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<xi:fallback/>
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</xi:include>
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.weakreference')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[not(@role='procedural')])">
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<xi:fallback/>
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</xi:include>
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</classsynopsis>
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<!-- }}} -->
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</section>
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<section xml:id="weakreference.examples">
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<title>WeakReference Examples</title>
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<para>
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<example xml:id="weakreference.basic-example">
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<title>Basic WeakReference Usage</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$obj = new stdClass;
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$weakref = WeakReference::create($obj);
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var_dump($weakref->get());
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unset($obj);
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var_dump($weakref->get());
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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object(stdClass)#1 (0) {
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}
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NULL
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]]>
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</screen>
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</example>
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</para>
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</section>
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</partintro>
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&language.predefined.weakreference.construct;
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&language.predefined.weakreference.create;
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&language.predefined.weakreference.get;
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</phpdoc:classref>
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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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