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<?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>include_once</title>
<?phpdoc print-version-for="include_once"?>
<para>
The <literal>include_once</literal> expression includes and evaluates
the specified file during the execution of the script.
This is a behavior similar to the <function>include</function> expression,
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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