Description:
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Tthe number -0,00 is non-existent and inconsistent, pointed out in a duplicate bug report, and therefore the output is jibberish.

If you do a number_format(round($foo,2), 2, ",", "."); then the output will be correct/as expected. This is also why number_format should be considered buggy. If number_format rounds before formatting, it should be consistent: -0,00 isn't consistent since -0,505 gets rounded to -0,51.

Please re-evaluate the situation. The output -0,00 is not useful.

Please note that our production server uses 4.3.8, but the Changelog reports nothing about a fix, and the previous bug report was marked Bogus.

Reproduce code:
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<?
echo number_format(-0.0012499999998, 2, ",", ".");
?>

Expected result:
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0,00

Actual result:
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-0,00