Generate Total Execution Time on PHP in miliseconds

getTotalExecutionTime.php

<?php 

//place this before any script you want to calculate time
$time_start = microtime(true);

// your script code goes here

// do something
Put this at the end of your php file:

// Display Script End time
$time_end = microtime(true);

//total execution time in miliseconds
$execution_time = $time_end - $time_start;

//execution time of the script
echo '<b>Total Execution Time:</b> '.$execution_time.' Miliseconds';