Date(); returning same time even with an event in php -

is there way this? because both $timestart , $timestop give me same result tho theres event between both.

<?php  $timestart = strtotime(date('h:i:s', time()));  if(isset($_post['choix186']) ){     $timestop = strtotime(date('h:i:s', time()));     $duree = $timestop - $timestart;     }  print $duree";  ?> 

the "standard" timer script one:

example #1 timing script execution microtime()

$time_start = microtime_float();  // sleep while usleep(100);  $time_end = microtime_float(); $time = $time_end - $time_start;  echo "did nothing in $time seconds\n"; ?> 

example #2 timing script execution in php 5

<?php $time_start = microtime(true);  // sleep while usleep(100);  $time_end = microtime(true); $time = $time_end - $time_start;  echo "did nothing in $time seconds\n"; ?> 

example #3 microtime() , request_time_float (as of php 5.4.0)

<?php // randomize sleeping time usleep(mt_rand(100, 10000));  // of php 5.4.0, request_time_float available in $_server superglobal array. // contains timestamp of start of request microsecond precision. $time = microtime(true) - $_server["request_time_float"];  echo "did nothing in $time seconds\n"; ?> 

source: http://php.net/manual/en/function.microtime.php

nothing add, manual knows all