Que pensez vous de mon fichier

<?php
//debut recherche ip de la personne
$filename = 'test.txt';
if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
$somecontent=$_SERVER['HTTP_X_FORWARDED_FOR'];
else
$somecontent=$_SERVER['REMOTE_ADDR'];
//fin recherche ip de la personne
//debut de recherche pour la localisation de la personne
  $ip = $somecontent;
      // Use JSON encoded string and converts 
    // it into a PHP variable 
    $ipdat = @json_decode(file_get_contents( 
        "http://www.geoplugin.net/json.gp?ip=" . $ip)); 
    $country = $ipdat->geoplugin_countryName; 
    $city = $ipdat->geoplugin_city; 
    $continent_name = $ipdat->geoplugin_continentName; 
    $latitude = $ipdat->geoplugin_latitude; 
    $longitude = $ipdat->geoplugin_longitude; 
    $currency_symbol = $ipdat->geoplugin_currencySymbol; 
    $currency_code = $ipdat->geoplugin_currencyCode; 
    $timezone = $ipdat->geoplugin_timezone; ;
	//fin de recherche pour la localisation de la personne
	//debut de recherche du navigateur de la personne
	$browser = $_SERVER['HTTP_USER_AGENT'];
//fin de recherche du navigateur de la personne
//debut de recherche du systeme d exploitation de la personne
$user_agent = getenv("HTTP_USER_AGENT");

if (strpos($user_agent, "Win") !== FALSE)
    $os = "Windows";
elseif ((strpos($user_agent, "Mac") !== FALSE) || (strpos($user_agent, "PPC") !== FALSE))
    $os = "Mac";
elseif (strpos($user_agent, "Linux") !== FALSE)
    $os = "Linux";
elseif (strpos($user_agent, "FreeBSD") !== FALSE)
    $os = "FreeBSD";
elseif (strpos($user_agent, "SunOS") !== FALSE)
    $os = "SunOS";
elseif (strpos($user_agent, "IRIX") !== FALSE)
    $os = "IRIX";
elseif (strpos($user_agent, "BeOS") !== FALSE)
    $os = "BeOS";
elseif (strpos($user_agent, "OS/2") !== FALSE)
    $os = "OS/2";
elseif (strpos($user_agent, "AIX") !== FALSE)
    $os = "AIX";
else
    $os = "Autre";
//fin de recherche du systeme d exploitation de la personne


//debut recherche http visite de la personne
if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on')
    $link = "https";
else
    $link = "http";
 // Here append the common URL characters.
$link .= "://";
  // Append the host(domain name, ip) to the URL.
$link .= $_SERVER['HTTP_HOST'];
 // Append the requested resource location to the URL
$link .= $_SERVER['REQUEST_URI'];
//fin recherche http visite de la personne
//debut recherche heure de la personne
$date=$_SERVER['REQUEST_TIME'];
setlocale(LC_TIME, "fr_FR");
$date1 = date('Y-m-d H:i:s', $date +7200); // Date du jour
//fin recherche heure de la personne
// Assurons nous que le fichier est accessible en écriture
if (is_writable($filename)) {
// Dans notre exemple, nous ouvrons le fichier $filename en mode d'ajout
// Le pointeur de fichier est placé à la fin du fichier
// c'est là que $somecontent sera placé
if (!$handle = fopen($filename, 'a')) {
echo "Impossible d'ouvrir le fichier ($filename)";
exit;
}
// Ecrivons quelque chose dans notre fichier.
echo $date2;
if (fwrite($handle,strftime("%A %d %B %G %H:%M:%S", strtotime($date1))."\t $os.\t $browser.\t $country.\t  $city\t $somecontent.\t $link.\r\n") === FALSE) {
echo "Impossible d'écrire dans le fichier ($filename)";
exit;
}
echo "L'écriture de ($somecontent) dans le fichier ($filename) a réussi";
fclose($handle);
} else {
echo "Le fichier $filename n'est pas accessible en écriture.";
}
?>

function getUserIP(){
  if (!empty($_SERVER["HTTP_CLIENT_IP"]){
   //check for ip from share internet
   $ip = $_SERVER["HTTP_CLIENT_IP"];
  }elseif (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){
   // Check for the Proxy User
   $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
  }else{
   $ip = $_SERVER["REMOTE_ADDR"];
  }
  return $ip;
}

function getBrowser()
{
    $u_agent = $_SERVER['HTTP_USER_AGENT'];
    $bname = 'Unknown';
    $platform = 'Unknown';
    $version= "";

    //First get the platform?
    if (preg_match('/linux/i', $u_agent)) {
        $platform = 'linux';
    }
    elseif (preg_match('/macintosh|mac os x/i', $u_agent)) {
        $platform = 'mac';
    }
    elseif (preg_match('/windows|win32/i', $u_agent)) {
        $platform = 'windows';
    }
   
    // Next get the name of the useragent yes seperately and for good reason
    if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent))
    {
        $bname = 'Internet Explorer';
        $ub = "MSIE";
    }
    elseif(preg_match('/Firefox/i',$u_agent))
    {
        $bname = 'Mozilla Firefox';
        $ub = "Firefox";
    }
    elseif(preg_match('/Chrome/i',$u_agent))
    {
        $bname = 'Google Chrome';
        $ub = "Chrome";
    }
    elseif(preg_match('/Safari/i',$u_agent))
    {
        $bname = 'Apple Safari';
        $ub = "Safari";
    }
    elseif(preg_match('/Opera/i',$u_agent))
    {
        $bname = 'Opera';
        $ub = "Opera";
    }
    elseif(preg_match('/Netscape/i',$u_agent))
    {
        $bname = 'Netscape';
        $ub = "Netscape";
    }
   
    // finally get the correct version number
    $known = array('Version', $ub, 'other');
    $pattern = '#(?<browser>' . join('|', $known) .
    ')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
    if (!preg_match_all($pattern, $u_agent, $matches)) {
        // we have no matching number just continue
    }
   
    // see how many we have
    $i = count($matches['browser']);
    if ($i != 1) {
        //we will have two since we are not using 'other' argument yet
        //see if version is before or after the name
        if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
            $version= $matches['version'][0];
        }
        else {
            $version= $matches['version'][1];
        }
    }
    else {
        $version= $matches['version'][0];
    }
   
    // check if we have a number
    if ($version==null || $version=="") {$version="?";}
   
    return array(
        'userAgent' => $u_agent,
        'name'      => $bname,
        'version'   => $version,
        'platform'  => $platform,
        'pattern'    => $pattern
    );
}

getenv("HTTP_USER_AGENT")

 $_SERVER["HTTP_USER_AGENT"]

// now try it
$ua=getBrowser();
$yourbrowser= "Your browser: " . $ua['name'] . " " . $ua['version'] . " on " .$ua['platform'] . " reports: <br >" . $ua['userAgent'];
print_r($yourbrowser);

 elseif(preg_match('/Trident/i',$u_agent))
    {
        $bname = 'Internet explorer';
        $ub = "Trident";
    }