php判断用户浏览器类型与来自页面-PHP源码

function chkre(){
global $_SERVER, $r_main;
if(isset($_SERVER['HTTP_REFERER'])){
$u=parse_url($_SERVER['HTTP_REFERER']);
if($u['host']!=$_SERVER['HTTP_HOST'])return false;
}
return true;
}

function chkuag($a='MSIE'){
global $_SERVER;
if(isset($_SERVER['HTTP_USER_AGENT'])){
$age=strtoupper($_SERVER['HTTP_USER_AGENT']);
if(strstr($age, $a))return true;
}
return false;
}