In the context of PHP, what are some alternative approaches or techniques to identify and differentiate between various browsers used by visitors to a website?

One approach to identify and differentiate between various browsers used by visitors to a website in PHP is to use the `$_SERVER['HTTP_USER_AGENT']` variable, which contains information about the user's browser. By parsing this variable, you can extract details such as the browser name, version, and operating system.

$user_agent = $_SERVER['HTTP_USER_AGENT'];

if (strpos($user_agent, 'Firefox') !== false) {
    echo 'You are using Firefox browser';
} elseif (strpos($user_agent, 'Chrome') !== false) {
    echo 'You are using Chrome browser';
} elseif (strpos($user_agent, 'Safari') !== false) {
    echo 'You are using Safari browser';
} else {
    echo 'You are using a different browser';
}