PHP implementation of the Internet link to prohibit the way to view the Web page

Prohibit Internet links (such as search engines) from viewing Web page content
if (!empty ($_server[' http_referer '))
{
Preg_match ("/^" (http://)? [^/]+)/I ", $_server[' Http_referer '], $matches);
$host = $matches [2];
if ($host = = "211.152.50.35") | | ($host ==www.phpv.net))
{
}
Else
{
Header ("Location:http://www.phpv.net");
Exit
}
}
No direct input to the Web site to view the content
Else
{
Header ("Location:http://www.phpv.net");
Exit
}

Only click on the hyperlink (that is, <a href=...>) open page only http_referer environment variables, such as window.open (), window.location= ..., Window.showmodelessdialog () and other open windows do not have http_referer environment variables, such restrictions will make the site a lot less activity. Of course, the fish and bear cake can not be both, hehe.
Is it simpler to write?
if (($host!= "211.152.50.35") && ($host!=www.phpv.net)) {
Header ("Location:http://www.phpv.net");
Exit
}