Two methods:

One is to judge the browser of the current request on the server side, otherwise it returns false

The second is to judge through the front-end js code

The specific code can be searched on Baidu

It's no use. Why did you mess up the layout?

<?php
/** 
* 检测用户当前浏览器 
* @return boolean 是否ie浏览器 
*/ 
function chk_ie_browser() { 
$userbrowser = $_SERVER['HTTP_USER_AGENT']; 
if ( preg_match( '/MSIE/i', $userbrowser ) ) { 
$usingie = true; 
} else { 
$usingie = false; 
} 
return $usingie; 
} 
$i=chk_ie_browser();
if($i==true){
echo'你用的是IE浏览器！';
}else{
 echo'你用的不是IE浏览器！';
 }