PHP浏览器条件

Question

What I am trying to do is making a PHP Conditional specifically for IE9. What I've tried so far are these two PHP Browser Conditionals

if(preg_match('/(?i)msie [9]/',$_SERVER['HTTP_USER_AGENT'])) 
{ 
   //my code here 
   exit; 
}

if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) 
{
   //my code here 
}

Did I write them incorrectly? Am I missing something?

Answer 1

if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 9.') !== false) { 
  //my code here 
   exit; 
}