What are the potential drawbacks of measuring query execution time in PHP using microtime?

Potential drawbacks of measuring query execution time in PHP using microtime include the fact that microtime can be affected by system load and other external factors, leading to inconsistent results. To mitigate this issue, it is recommended to use PHP's built-in functions for measuring time accurately, such as hrtime(true) which provides high-resolution timing.

$start = hrtime(true);

// Perform the query execution here

$end = hrtime(true);
$executionTime = ($end - $start) / 1e+9; // Convert to seconds
echo "Query execution time: " . $executionTime . " seconds";