How to get duration in microseconds

Question

I want to measure how long a specified part of my php script takes, e.g.

$startTime = microtime(true);
//some operations which needs 0.1 to 100 seconds to run
$endTime = microtime(true);

How can I get the duration in microseconds as an integer?

This does not work:

$duration = (int)($endTime - $startTime);

Why not use `round` ... `$duration = round($endTime - $startTime);` ... it returns a float type, but it will return an integer ... — keithhatfield, Mar 20 '12 at 19:53
you are getting the time as an integer, you just have a very basic misunderstanding of what an integer is. anything less that 1 will be set to 0 when you cast it with (int). you probably want something more like $duration = $endTime-$startTime; $duration = number_format($duration,2); — Garry Welding, Mar 20 '12 at 19:53
Wait, let's define what you mean by 'microseconds as an integer' ... if the script takes .23 seconds to run are you wanting to see 230? — keithhatfield, Mar 20 '12 at 19:58
@dleiftah yes, I need the microseconds (2300) not the seconds — Roland, Mar 20 '12 at 19:59

score 4 · Accepted Answer · edited Jun 29 '12 at 17:41

4

If you want microseconds as an integer:

$duration = round(($endTime - $startTime) * 1000000)

edited Jun 29 '12 at 17:41

hakre

answered Mar 20 '12 at 19:59

keithhatfield

4

So you got milliseconds. It would be *pow(10,6). – Luca Rainone Mar 20 '12 at 20:05
2

perfect! Also works: (int)(($endTime - $startTime) * pow(10,6)) – Mike Mar 20 '12 at 20:22
As a note ... casting as a int will always round down, so there is a chance that the two will produce different results ... – keithhatfield Mar 20 '12 at 20:25

1 Answers1