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# bcmath_compat
[![Software License][ico-license]](LICENSE.md)
[![Build Status][ico-travis]][link-travis]
PHP 5.x-8.x polyfill for bcmath extension
## Installation
With [Composer](https://getcomposer.org/):
```bash
$ composer require phpseclib/bcmath_compat
```
## Installation On Heroku
bcmath_compat does not install the normal way on Heroku / Composer < 2.0 because Heroku [uses modified composer.json's](https://github.com/phpseclib/bcmath_compat/issues/1#issuecomment-573112000). Composer 2 [makes this a non-issue](https://github.com/phpseclib/bcmath_compat/issues/1#issuecomment-618951036).
In light of this the way to install this on Heroku with Composer < 2.0 is to do the following:
```bash
$ composer require phpseclib/bcmath_compat:1.0.4
```
## Limitations
- `extension_loaded('bcmath')`
bcmath_compat cannot make this return true. The recommended remediation is to not do this.
- `ini_set('bcmath.scale', ...)`
You cannot set configuration options for extensions that are not installed. If you do `ini_set('bcmath.scale', 5)` on a system without bcmath installed then `ini_get('bcmath.scale')` will return `false`. It's similar to what happens when you do `ini_set('zzz', 5)` and then `ini_get('zzz')`. You'll get `false` back.
The recommended remediation to doing `ini_set('bcmath.scale', ...)` is to do `bcscale(...)`. The recommended remediation for doing `ini_get` is (if you're using PHP >= 7.3.0) to do `bcscale()` or (if you're using PHP < 7.3.0) to do `max(0, strlen(bcadd('0', '0')) - 2)`.
Note that `ini_get` always returns a string whereas the recommended remediations return integers.
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[link-packagist]: https://packagist.org/packages/phpseclib/bcmath_compat
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[link-downloads]: https://packagist.org/packages/phpseclib/bcmath_compat
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