Use php to detect whether the browser the user is currently using is IE

 
/** 
*  Detects the user's current browser  
* @return boolean  Whether or not ie The browser  
*/ 
function chk_ie_browser() { 
$userbrowser = $_SERVER['HTTP_USER_AGENT']; 
if ( preg_match( '/MSIE/i', $userbrowser ) ) { 
$usingie = true; 
} else { 
$usingie = false; 
} 
return $usingie; 
}