php-doc-en/language/control-structures/include-once.xml
George Peter Banyard af6fdf16ab Remove PHP 4 and 5.0.0 mentions.
This includes changelogs but also some paragraphs and notes which mention PHP 4.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@347043 c90b9560-bf6c-de11-be94-00142212c4b1
2019-03-24 19:38:53 +00:00

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<?xml version="1.0" encoding="utf-8"?>
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<sect1 xml:id="function.include-once" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>include_once</title>
<?phpdoc print-version-for="include_once"?>
<para>
The <literal>include_once</literal> 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, and include_once returns &true;. As the name suggests,
the file will be included just once.
</para>
<para>
<literal>include_once</literal> 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>
</sect1>
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