/**
 * PHP检测客户端浏览器类型代码
 *
 * @param 
 * @arrange 512-笔记网： jb51.cc
 **/
$viewer = getenv( "HTTP_USER_AGENT" );
$browser = "An unidentified browser";
if( preg_match( "/MSIE/i","$viewer" ) )
{
  $browser = "Internet Explorer";
}
else if(  preg_match( "/Netscape/i","$viewer" ) )
{
  $browser = "Netscape";
}
else if(  preg_match( "/Mozilla/i","$viewer" ) )
{
  $browser = "Mozilla";
}
$platform = "An unidentified OS!";
if( preg_match( "/Windows/i","$viewer" ) )
{
  $platform = "Windows!";
}
else if ( preg_match( "/Linux/i","$viewer" ) )
{
  $platform = "Linux!";
}
echo("You are using $browser on $platform");

/***   来自编程之家 jb51.cc（jb51.cc）   ***/