//偵測瀏覽器
$agent = $_SERVER['HTTP_USER_AGENT']; 
if(strpos($agent,"MSIE 8.0"))    
  echo "Internet Explorer 8.0"; 
else if(strpos($agent,"MSIE 7.0")) 
  echo "Internet Explorer 7.0"; 
else if(strpos($agent,"MSIE 6.0")) 
  echo "Internet Explorer 6.0"; 
else if(strpos($agent,"Firefox/3")) 
  echo "Firefox 3"; 
else if(strpos($agent,"Firefox/2")) 
  echo "Firefox 2"; 
else if(strpos($agent,"Chrome")) 
  echo "Google Chrome"; 
else if(strpos($agent,"Safari")) 
  echo "Safari"; 
else if(strpos($agent,"Opera")) 
  echo "Opera"; 
else    
  echo $agent;