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php中的require-once，phprequire-once

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Release： 2016-06-13 08:55:39
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php中的require-once，phprequire-once

require_once语句和require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。

参见include_once的文档来理解_once的含义，并理解与没有_once时候有什么不同。

使用方法

define('__ROOT__',dirname(dirname(__FILE__)));
require_once(__ROOT__.'/config.php');
?>
　　方法二:

2例如：编辑

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require_once('sys/config.php');

require_once('header.php');

?>

系统平台

一个简单的留言板系统平台


一个简单的留言板。

require_once('footer.php');

?>
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