https://wiki.php.net/rfc/adding_bcround_bcfloor_bcceil_to_bcmath
PHP: rfc:adding_bcround_bcfloor_bcceil_to_bcmath
phprfcaddingbcmath
https://www.php.net/bcceil
PHP: bcceil - Manual
Round up arbitrary precision number
phpmanual
https://www.php.net/manual/ja/function.bcceil.php
PHP: bcceil - Manual
phpmanual
https://www.php.net/manual/en/function.bcceil.php
PHP: bcceil - Manual
Round up arbitrary precision number
phpmanual