function get_browser_ver(){
preg_match('/MSIE (.*?);/', $_SERVER['HTTP_USER_AGENT'], $matches);
if(count($matches)<2){
  preg_match('/Trident\/\d{1,2}.\d{1,2}; rv:([0-9]*)/', $_SERVER['HTTP_USER_AGENT'], $matches);
}

if (count($matches)>1){
  //Then we're using IE
  $version = $matches[1];
 //Returning version
  return $version;

  switch(true){
    case ($version<=8):
      //IE 8 or under!
      break;

    case ($version==9 || $version==10):
      //IE9 & IE10!
      break;

    case ($version==11):
      //Version 11!
      break;

    default:
      //You get the idea
  }
}
}//end function
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