php根据网址域名来路跳转的代码

<p><?php   </p><p>$sUrl = $_SERVER['SERVER_NAME'];</p>
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                <p>if ($sUrl=="www.abc.com"){   </p><p>echo '<meta http-equiv="refresh" content="0; url=http://www.abc.com/index.html">';</p><p>}</p><p>if ($sUrl=="www.123.com"){   </p><p>echo '<meta http-equiv="refresh" content="0; url=http://www.123.com/main.html">';</p><p>}</p><p>?></p><p>