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Review is welcome git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@341282 c90b9560-bf6c-de11-be94-00142212c4b1
69 lines
2.0 KiB
XML
69 lines
2.0 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<sect1 xml:id="language.types.resource">
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<title>Resources</title>
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<para>
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A <type>resource</type> is a special variable, holding a reference to an
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external resource. Resources are created and used by special functions. See
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the <link linkend="resource">appendix</link> for a listing of all these
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functions and the corresponding <type>resource</type> types.
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</para>
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<para>
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See also the <function>get_resource_type</function> function.
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</para>
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<sect2 xml:id="language.types.resource.casting">
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<title>Converting to resource</title>
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<para>
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As <type>resource</type> variables hold special handles to opened files,
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database connections, image canvas areas and the like, converting to a
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<type>resource</type> makes no sense.
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</para>
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</sect2>
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<sect2 xml:id="language.types.resource.self-destruct">
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<title>Freeing resources</title>
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<para>
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Thanks to the reference-counting system being part of Zend Engine,
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a <type>resource</type> with no more references to it is detected
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automatically, and it is freed by the garbage collector. For this reason, it
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is rarely necessary to free the memory manually.
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</para>
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<note>
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<simpara>
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Persistent database links are an exception to this rule. They are
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<emphasis>not</emphasis> destroyed by the garbage collector. See the
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<link linkend="features.persistent-connections">persistent
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connections</link> section for more information.
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</simpara>
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</note>
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</sect2>
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</sect1>
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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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