how is this line a security risk?

From: Date: Tue, 23 Sep 2008 16:58:07 +0000
Subject: how is this line a security risk?
References: 1 2 3 4 5  Groups: php.db 
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I get an error stating that this line in my code is a security risk when I code it. require_once($PLUGINS_DIRECTORY."forum/forum.php"); here is what the explanation is: include() or analogous is used with variable argument this can be dangerous since variables are in many cases controlled by remote users. the recommended soloution is to write it this way define('SCRIPT_PATH',"/htdocs"); include ('sSCRIPT_PATH."/Foo.inc"); my question is why is the other way safer? im kinda confused..

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