mirror of
https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@343277 c90b9560-bf6c-de11-be94-00142212c4b1
105 lines
4.5 KiB
XML
105 lines
4.5 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<book xml:id="book.wincache" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Windows Cache for PHP</title>
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<titleabbrev>WinCache</titleabbrev>
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<preface xml:id="intro.wincache">
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&reftitle.intro;
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<para>
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Windows Cache Extension for PHP is a PHP accelerator that is used to increase the speed of
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PHP applications running on Windows and Windows Server. Once the Windows Cache Extension for
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PHP is enabled and loaded by the PHP engine, PHP applications can take advantage of the
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functionality without any code modifications.
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</para>
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<para>
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The Windows Cache Extension includes 5 different types of caches. The following describes
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the purpose of each cache type and the benefits it provides.
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</para>
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<itemizedlist>
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<listitem>
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<para>
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<emphasis>PHP Opcode Cache</emphasis> - PHP is a script processing engine, which reads
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an input stream of data that contains text and/or PHP instructions and produces another
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stream of data, most commonly in the HTML format. This means that on a web server the
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PHP engine reads, parses, compiles and executes a PHP script each time that it is requested
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by a Web client. The reading, parsing and compilation operations put additional load on the
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web server's CPU and file system and thus affect the overall performance of a PHP web application.
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The PHP bytecode (opcode) cache is used to store the compiled script bytecode in shared memory so
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that it can be re-used by PHP engine for subsequent executions of the same script.
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</para>
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<para>
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Support for opcode caching was removed in <literal>Wincache 2.0.0</literal>, all users who
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wish to have an opcache should use the <link linkend="book.opcache">OPcache</link> extension
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that is included with PHP as of PHP 5.5.0.
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>File Cache</emphasis> - Even with the PHP opcode cache enabled, the PHP engine
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has to accesses the script files on a file system. When PHP scripts are stored on a remote
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UNC file share, the file operations introduce a significant performance overhead.
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The Windows Cache Extension for PHP includes a file cache that is used to store the content
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of the PHP script files in shared memory, which reduces the amount of file system operations
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performed by PHP engine.
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>Resolve File Path Cache</emphasis> - PHP scripts very often include or operate
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with files by using relative file paths. Every file path has to be normalized to
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an absolute file path by the PHP engine. When a PHP application uses many PHP files and
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accesses them by relative paths, the operation of resolving the paths may negatively
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impact the application's performance. The Windows Cache Extension for PHP
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provides a Resolve File Path cache, which is used to store the mappings between relative
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and absolute file paths, thereby reducing the number of path resolutions that the
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PHP engine has to perform.
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>User Cache (available since version 1.1.0)</emphasis> - PHP scripts can take advantage of
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the shared memory cache by using the user cache API's. PHP objects and variables can be stored in the
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user cache and then re-used on subsequent requests. This can be used to improve performance of PHP scripts
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and to share the data across multiple PHP processes.
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>Session Handler (available since version 1.1.0)</emphasis> - The WinCache session handler can be used to
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store the PHP session data in the shared memory cache. This avoids file system operations for reading
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and writing session data, which improves performance when large amount of data is stored in PHP session.
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</para>
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</listitem>
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</itemizedlist>
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</preface>
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&reference.wincache.setup;
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&reference.wincache.constants;
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&reference.wincache.reference;
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&reference.wincache.win32build;
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</book>
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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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