Why doesn't microtime() work correctly?

Question

Laravel

I am writing a CLI utility for laravel 5.0, the code is something like this:

set_time_limit(0);
$this->exTimeStart = microtime();

....

$exTime = microtime() - $this->exTimeStart;

So, for some reason $exTime turns out to be negative . If you remove set_time_limit(0), then everything works correctly. What could be the problem? Thanks in advance.

Answer 1

microtime(true)