PHP profiling with microtime(): Negative time?
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by Boldewyn
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Published on 2010-04-09T11:58:30Z
Indexed on
2010/04/09
12:03 UTC
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Hit count: 365
For a very simple profiling I use microtime() like this:
$now = microtime();
for (...) {
// do something
echo microtime() - $now;
$now = microtime();
}
Now, the output of the echo line seems completely random, that is, I expected fluctuations, but I don't expected negative numbers showing up.
However, a typical result contains ~ 1/3 negative numbers. I confirmed this on Solaris (PHP 5.0.x) and WinVista (PHP 5.2.3).
What the heck is going on here? Have I invented accidently a time machine?
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