How can the microtime() function in PHP be utilized effectively for precise time calculations in script execution?

When precise time calculations are needed in PHP script execution, the microtime() function can be used effectively. This function returns the current Unix timestamp with microseconds, allowing for accurate time measurements within the script. By capturing the start and end times using microtime(), you can calculate the exact duration of script execution for performance tuning or other time-sensitive operations.

// Start time
$start_time = microtime(true);

// Perform time-sensitive operations here

// End time
$end_time = microtime(true);

// Calculate script execution time
$execution_time = $end_time - $start_time;

echo "Script execution time: " . $execution_time . " seconds";