id_nave.php

<?
  $useragent = $_SERVER['HTTP_USER_AGENT'];
 
  if (preg_match('|MSIE ([0-9].[0-9]{1,2})|',$useragent,$matched)) {
    $browser_version=$matched[1];
    $browser = '<meta http-equiv="content-type" content="text/html; charset="iso-8859-1">';
  } elseif (preg_match( '|Opera/([0-9].[0-9]{1,2})|',$useragent,$matched)) {
    $browser_version=$matched[1];
    $browser = '<meta http-equiv="content-type" content="text/html; charset="utf-8">';
  } elseif(preg_match('|Firefox/([0-9\.]+)|',$useragent,$matched)) {
    $browser_version=$matched[1];
    $browser = '<meta http-equiv="content-type" content="text/html; charset="iso-8859-1">';
  } elseif(preg_match('|Chrome/([0-9\.]+)|',$useragent,$matched)) {
    $browser_version=$matched[1];
    $browser = '<meta http-equiv="content-type" content="text/html; charset="utf-8">';
  } elseif(preg_match('|Safari/([0-9\.]+)|',$useragent,$matched)) {
    $browser_version=$matched[1];
    $browser = 'Safari';
  } else {
    // browser not recognized!
    $browser_version = 0;
    $browser= 'other';
  }
  return $browser;
?>