<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>require_once</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.include.html">include</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.include-once.html">include_once</a></div> <div class="up"><a href="language.control-structures.html">Control Structures</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.require-once" class="sect1"> <h2 class="title">require_once</h2> <p class="verinfo">(PHP 4, PHP 5)</p> <p class="para"> The <em>require_once</em> statement is identical to <span class="function"><a href="function.require.html" class="function">require</a></span> 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 <span class="function"><a href="function.include-once.html" class="function">include_once</a></span> documentation for information about the <em>_once</em> behaviour, and how it differs from its non <em>_once</em> siblings. </p> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.include.html">include</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.include-once.html">include_once</a></div> <div class="up"><a href="language.control-structures.html">Control Structures</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>
