PHP coding for finding browser and OS platform

This is find to web browser and OS platform using PHP.   preg_match() function using a identify to  browser and OS  platform .it's is manual coding to display a browser and OS details.simple coding to find browser.

getenv("HTTP_USER_AGENT");

 

<?php
    echo
getenv( "HTTP_USER_AGENT" );
?>

 

getenv() - Gets the value of an environment variable
      HTTP_USER_AGENT - This also is important when using the get_browser() function for finding out  

output:


     Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36

preg_match();

 

<?php
 $viewer = getenv( "HTTP_USER_AGENT" );
 if( preg_match( "/Mozilla/i", "$viewer" ) )
{
$browser = "Mozilla";
}

else
{

echo "undefined"; 
 }
echo $browser;
?>


  preg_match() — Perform a regular expression match
   
   if it's match to display a output else disaply undefined

output:


Mozilla

Source Code:


<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP Simple coding for finding web browser and OS Paltform</title>
</head>
<?php
$viewer = getenv( "HTTP_USER_AGENT" );
$browser = "An unidentified browser";
if( preg_match( "/MSIE/i", "$viewer" ) )
{
$browser = "Internet Explorer";
}
else if( preg_match( "/Chrome/i", "$viewer" ) )
{
$browser = "Chrome";
}
else if( preg_match( "/Mozilla/i", "$viewer" ) )
{
$browser = "Mozilla";
}
$platform = "An unidentified OS!";
if( preg_match( "/Windows/i", "$viewer" ) )
{
$platform = "Windows!";
}
else if ( preg_match( "/Linux/i", "$viewer" ) )
{
$platform = "Linux!";
}
echo("You are using $browser on $platform");
?>
<body>
</body>
</html>

DEMO OUTPUT IS :

    You are using Mozilla on Windows!