What are the potential pitfalls of using microtime() to stop page load time in PHP?

Using microtime() to measure page load time in PHP can be inaccurate due to the overhead of the function itself and other factors that may affect the timing. To accurately measure page load time, it is recommended to use PHP's built-in $_SERVER['REQUEST_TIME_FLOAT'] variable, which provides a more precise timestamp of when the request started processing. 

$start_time = $_SERVER['REQUEST_TIME_FLOAT'];

// Code execution

$end_time = microtime(true);
$page_load_time = $end_time - $start_time;

echo "Page load time: " . $page_load_time . " seconds";

Keywords

microtime page load time PHP precision performance

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