Martin Geisler wrote:
My PHP manual (from a Debian package) has the following note on the page for round():
Caution
When rounding on exact halves round() rounds down on evens and up on odds. If you want to always force it in one direction on a .5 (or .05 in your case) add or substract a tiny fuzz factor. The reason behind rounding half the values down and the other half up is to avoid the classical banking problem where if you always rounded down you would be stealing money from your customers, or if you always rounded up you would end up over time losing money. By averaging it out through evens and odds you statistically break even.
I'm surprised with this note on manuals. I do not know in other places, but in the European Union there are laws and directives that obligates to always round to 5/4 in currency operations (Specially on Euro Conversions). It means that 5 and above rounds always up, anything bellow 5 rounds always down. So, 0,655 must round to 0,66 and 0,654 must round to 0,65. In this case, nothing to do: It is the law.
And ... the funny note on laws (almost on spanish laws) says that computer programs wich round in a different way are not considered valid reasons to not round as stated above.
Regards, Jordi.
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