#兩個高精度數(shù)比較

#int?bccomp?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$left=$right?返回?0

#$left

#$left>$right?返回?1

#$scale?小數(shù)點位數(shù)

#兩個高精度數(shù)相加

#string?bcadd?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$scale?返回的小數(shù)點個數(shù)

#兩個高精度數(shù)相減

#sstring?bcsub?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$scale?返回的小數(shù)點個數(shù)

#兩個高精度數(shù)求余/取模

#string?bcmod?(?string?$left_operand?,?string?$modulus?)

#兩個高精度數(shù)相除

#string?bcdiv?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$scale小數(shù)點位數(shù)默認為?0

#兩個高精度數(shù)相乘

#string?bcmul?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$scale小數(shù)點位數(shù)默認為?0

#兩個高精度數(shù)的次方值

#string?bcpow?(?string?$left_operand?,?string?$right_operand?[,?int?$scale?]?)

#$scale小數(shù)點位數(shù)默認為?0

#求高精度數(shù)的平方根

#string?bcsqrt?(?string?$operand?[,?int?$scale?]?)

#$scale小數(shù)點位數(shù)默認為?0

#設(shè)置bc函數(shù)的小數(shù)點位數(shù)

#bool?bcscale?(?int?$scale?)

#$scale小數(shù)點位數(shù)默認為?0

原文：http://www.cnblogs.com/chunguang/p/4505603.html

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