How can the $_SERVER['HTTP_REFERER'] variable be used to track visitor origin in PHP?

The $_SERVER['HTTP_REFERER'] variable in PHP can be used to track the URL of the previous page that linked to the current page. This can be useful for tracking visitor origin or referral sources. To use this variable effectively, you can check its value and store it in a session variable for future use in your application. 

// Check if HTTP_REFERER is set and not empty
if(isset($_SERVER['HTTP_REFERER']) && !empty($_SERVER['HTTP_REFERER'])) {
    // Store the HTTP_REFERER value in a session variable
    session_start();
    $_SESSION['referrer'] = $_SERVER['HTTP_REFERER'];
}

Keywords

$_SERVER HTTP_REFERER variable track visitor origin

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