Fixed the sign to be PLUS if the result is 0 (#15599)

ext/bcmath: Avoid unnecessary memset from `_bc_do_add` (#14257)

Apply the same changes as #14180 to _bc_do_add.

[RFC] Add bcfloor, bcceil and bcround to BCMath (#13096)

Implementation for the "Adding bcround, bcfloor and bcceil to BCMath" RFC: https://wiki.php.net/rfc/adding_bcround_bcfloor_bcceil_to_

[RFC] Add bcfloor, bcceil and bcround to BCMath (#13096)

Implementation for the "Adding bcround, bcfloor and bcceil to BCMath" RFC: https://wiki.php.net/rfc/adding_bcround_bcfloor_bcceil_to_bcmath

* Separated round mode into separate header file

Co-authored-by: Gina Peter Banyard <girgias@php.net>

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