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# VII. BCMath Arbitrary Precision Mathematics Functions

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

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

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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.

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表格 1. 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 附錄 G.

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bcmath.scale integer

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

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