mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-18 01:48:55 +00:00
af4410a7e1
still using this, after discussion on the phpdoc list. From now on, manual.ced will need to be found at ~/.phpdoc/manual.ced. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@288721 c90b9560-bf6c-de11-be94-00142212c4b1
69 lines
2.2 KiB
XML
69 lines
2.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!-- $Revision$ -->
|
|
|
|
<sect1 xml:id="function.include-once" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
|
|
<title><function>include_once</function></title>
|
|
<para>
|
|
The <function>include_once</function> statement includes and evaluates
|
|
the specified file during the execution of the script.
|
|
This is a behavior similar to the <function>include</function> statement,
|
|
with the only difference being that if the code from a file has already
|
|
been included, it will not be included again. As the name suggests,
|
|
it will be included just once.
|
|
</para>
|
|
<para>
|
|
<function>include_once</function> may be used in cases where
|
|
the same file might be included and evaluated more than once during a
|
|
particular execution of a script, so in this case it may help avoid
|
|
problems such as function redefinitions, variable value reassignments, etc.
|
|
</para>
|
|
<para>
|
|
See the <function>include</function> documentation for information about
|
|
how this function works.
|
|
</para>
|
|
<para>
|
|
<note>
|
|
<para>
|
|
With PHP 4, <literal>_once</literal> functionality differs with case-insensitive
|
|
operating systems (like Windows) so for example:
|
|
<example>
|
|
<title><function>include_once</function> with a case insensitive OS in PHP 4</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
include_once "a.php"; // this will include a.php
|
|
include_once "A.php"; // this will include a.php again! (PHP 4 only)
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
</para>
|
|
<para>
|
|
This behaviour changed in PHP 5, so for example with Windows the path is normalized first so that
|
|
<filename>C:\PROGRA~1\A.php</filename> is realized the same as
|
|
<filename>C:\Program Files\a.php</filename> and the file is included just once.
|
|
</para>
|
|
</note>
|
|
</para>
|
|
</sect1>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|