Forum und email
函數參考
PHP Manual

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。

BC math configuration options
Name Default Changeable Changelog
bcmath.scale "0" PHP_INI_ALL  
For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

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。

Table of Contents

  • bcadd — Add two arbitrary precision numbers
  • bccomp — Compare two arbitrary precision numbers
  • bcdiv — Divide two arbitrary precision numbers
  • bcmod — Get modulus of an arbitrary precision number
  • bcmul — Multiply two arbitrary precision number
  • bcpow — Raise an arbitrary precision number to another
  • bcpowmod — Raise an arbitrary precision number to another, reduced by a specified modulus
  • bcscale — Set default scale parameter for all bc math functions
  • bcsqrt — Get the square root of an arbitrary precision number
  • bcsub — Subtract one arbitrary precision number from another
函數參考
PHP Manual