How can session variables be effectively utilized to track the duration of a page request in PHP?

Session variables can be effectively utilized to track the duration of a page request in PHP by storing the current timestamp when the page is loaded and then calculating the difference between the current timestamp and the stored timestamp when the page is requested again. This can provide valuable information on how long a user spends on a particular page. 

// Start the session
session_start();

// Store the current timestamp in a session variable when the page is loaded
if (!isset($_SESSION['start_time'])) {
    $_SESSION['start_time'] = time();
}

// Calculate the duration of the page request
$duration = time() - $_SESSION['start_time'];

// Display the duration in seconds
echo "Page duration: " . $duration . " seconds";

// Reset the session variable for the next page request
unset($_SESSION['start_time']);

Keywords

session variables page request duration tracking PHP utilization

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