Введение

For arbitrary precision mathematics PHP offers the Binary Calculator which supports numbers of any size and precision, represented as strings.

Коментарии

The regular expression is not quite right as I testing.
The number 20.00000509 which not match /^[+-]?[0]*[1-9]*[.]?[0-9]*$/ will pass the bcmatch format.

I think reference to source in the php_str2num function will be better. It is more like /^[+-]?(0|[1-9][0-9]*)[.]?[0-9]*$/ to me.
https://github.com/php/php-src/blob/master/ext/bcmath/bcmath.c
2021-05-06 09:00:40
http://php5.kiev.ua/manual/ru/intro.bc.html

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