What are the potential drawbacks or limitations of using PHP to track page load times?

One potential drawback of using PHP to track page load times is that it may add overhead to the page load itself, potentially affecting the accuracy of the timing measurements. To mitigate this issue, you can use a lightweight method to record the start and end times of the page load without introducing significant additional processing.

// Record the start time of the page load
$start_time = microtime(true);

// Your PHP code for the page goes here

// Record the end time of the page load
$end_time = microtime(true);

// Calculate the page load time
$page_load_time = $end_time - $start_time;

// Output the page load time
echo "Page load time: " . $page_load_time . " seconds";