How can PHP be used to retrieve the HTTP_REFERER value for a back button functionality?

To retrieve the HTTP_REFERER value for a back button functionality in PHP, you can use the $_SERVER['HTTP_REFERER'] variable. This variable contains the URL of the referring page from which the current page was accessed. By storing this value in a session variable, you can use it to redirect the user back to the previous page when needed. 

session_start();

if(isset($_SERVER['HTTP_REFERER'])) {
    $_SESSION['previous_page'] = $_SERVER['HTTP_REFERER'];
}

// To redirect back to the previous page:
if(isset($_SESSION['previous_page'])) {
    header('Location: ' . $_SESSION['previous_page']);
    exit;
} else {
    // Default redirect if no previous page is set
    header('Location: index.php');
    exit;
}

Keywords

PHP HTTP_REFERER back button retrieve functionality

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