Source of: /manual/en/function.require-once.php
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<div id="function.require-once" class="sect1">
<h2 class="title"><b>require_once()</b></h2>
<p class="para">
The <b>require_once()</b> statement is identical to
<a href="function.require.php" class="function">require()</a> except PHP will check if the file has
already been included, and if so, not include (require) it again.
</p>
<p class="para">
See the <a href="function.include-once.php" class="function">include_once()</a> documentation for information
about the <i>_once</i> behaviour, and how it differs from
its non <i>_once</i> siblings.
</p>
</div><?php manual_footer(); ?>
