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20 lines
998 B
HTML
20 lines
998 B
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>require_once</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.require-once" class="sect1">
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<h2 class="title"><span class="function"><strong>require_once</strong></span></h2>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p>
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<p class="para">
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<em>require_once</em> 语句和 <span class="function"><a href="require.html" class="function">require</a></span>
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语句完全相同，唯一区别是 PHP 会检查该文件是否已经被包含过，如果是则不会再次包含。
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</p>
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<p class="para">
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参见 <span class="function"><a href="include_once.html" class="function">include_once</a></span> 的文档来理解
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<em>_once</em> 的含义，并理解与没有 <em>_once</em> 时候有什么不同。
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</p>
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</div></div></div></body></html> |