How to subtract microtime and display date with milliseconds in php?

Question

How to subtract microtime and display date with milliseconds in php ?

For example: I have set end date and time

$endtime = 2012-02-21 10:29:59;
         


        

Answer 1

Well phpmyadmin uses this a code like this to calculate the time that a query took. It's similar to your requirements:

//time before
list($usec, $sec) = explode(' ',microtime($starttime));
$querytime_before = ((float)$usec + (float)$sec);
/* your code */

//time after
list($usec, $sec) = explode(' ',microtime($endtime));
$querytime_after = ((float)$usec + (float)$sec);
$querytime = $querytime_after - $querytime_before;

I think this should work for you. You just have to figure your output format