mirror of
https://github.com/sigmasternchen/php-doc-en
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10691d2154
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@241325 c90b9560-bf6c-de11-be94-00142212c4b1
92 lines
3 KiB
XML
92 lines
3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.13 $ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.clearstatcache">
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<refnamediv>
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<refname>clearstatcache</refname>
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<refpurpose>Clears file status cache</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>void</type><methodname>clearstatcache</methodname>
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<void/>
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</methodsynopsis>
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<para>
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When you use <function>stat</function>, <function>lstat</function>, or
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any of the other functions listed in the affected functions list (below),
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PHP caches the information those functions return in order to provide
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faster performance. However, in certain cases, you may want to clear the
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cached information. For instance, if the same file is being checked
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multiple times within a single script, and that file is in danger of
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being removed or changed during that script's operation, you may elect to
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clear the status cache. In these cases, you can use the
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<function>clearstatcache</function> function to clear the information
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that PHP caches about a file.
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</para>
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<para>
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You should also note that PHP doesn't cache information about non-existent
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files. So, if you call <function>file_exists</function> on a file that
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doesn't exist, it will return &false; until you create the file. If you
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create the file, it will return &true; even if you then delete the file.
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However <function>unlink</function> clears the cache automatically.
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</para>
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<note>
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<para>
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This function caches information about specific filenames, so you only
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need to call <function>clearstatcache</function> if you are performing
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multiple operations on the same filename and require the information
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about that particular file to not be cached.
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</para>
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</note>
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<para>
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Affected functions include <function>stat</function>,
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<function>lstat</function>,
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<function>file_exists</function>,
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<function>is_writable</function>,
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<function>is_readable</function>,
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<function>is_executable</function>,
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<function>is_file</function>,
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<function>is_dir</function>,
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<function>is_link</function>,
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<function>filectime</function>,
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<function>fileatime</function>,
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<function>filemtime</function>,
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<function>fileinode</function>,
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<function>filegroup</function>,
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<function>fileowner</function>,
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<function>filesize</function>,
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<function>filetype</function>, and
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<function>fileperms</function>.
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.void;
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</para>
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</refsect1>
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</refentry>
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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:"../../../../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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