[PHP-NOTES] note 130462 added to language.operators.arithmetic

The modulo % does not work on Floats, use fmod() 
https://www.php.net/manual/en/function.fmod.php

php > echo (1.1 % 1);
0

php > echo fmod(1.1, 1);
0.1

Could be a discussion on if it should, but at least at the moment it doesn't.

https://en.wikipedia.org/wiki/Modulo
has a list of languages that do/don't support modulo on floats
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