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# V. BCMath Arbitrary Precision Mathematics Functions

# 介紹

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

# 需求

Since PHP 4.0.4, libbcmath is bundled with PHP. You don't need any external libraries for this extension.

# 安裝

These functions are only available if PHP was configured with --enable-bcmath. In PHP 3, these functions are only available if PHP was not configured with --disable-bcmath.

Windows 版本的 PHP 已內建此延伸的支援﹐所以你毋須再載入附加的延伸來使用這些功能。

# 執行時期組態

`php.ini`中的設定會影響這些函數的行為。

表格 1. BC math configuration options

Name | Default | Changeable
--- | --- | ---
bcmath.scale | 0 | PHP_INI_ALL

For further details and definitions of the PHP_INI_* constants, see the 附錄 H.

這裡為簡短的結構指令說明。

bcmath.scale integer

  Number of decimal digits for all bcmath functions. See also bcscale().

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

這個延伸沒有定義任何常數。

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