/** 
  * 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;  
 }