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Add a convenience function for computing elapsed microtime deltas
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Authored by epriestley on Nov 8 2018, 2:13 PM.
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Details

Summary

See D19780. We have a reasonable amount of 1000000 * ($t_end - $t_start) stuff in the codebase that we could simplify. In particular, it would be easy to have too many or too few 0s somewhere and escape notice.

I landed on this method signature instead of phutil_microseconds_between(x, y) since I think it would be hard to remember if parameter order is start, end (chronological) or end, start (like arithmetic subtraction). It should be a little simpler to use in most cases, too.

Test Plan
$ cat test.php
<?php

require_once 'scripts/init/init-script.php';

$start = microtime(true);

sleep(1);

echo phutil_microseconds_since($start);
echo "\n";
$ php -f test.php
1001921

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rPHU libphutil
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