Detailed explanation of PHP high-precision operation BC function library-PHP Tutorial-php.cn

Detailed explanation of PHP high-precision operation BC function library

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Release： 2023-03-19 08:12:02

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This article mainly introduces the PHP high-precision operation BC function library, and analyzes the functions of bccomp, bcadd, bcsub, bcmod, bcp, bcmul and other functions in the BC function library as well as the use of high-precision mathematical operations in the form of examples. Friends in need can refer to it. I hope it will be helpful to everyone.

<?php
 /***************************************************************************************
 *php BC高精确度函数库
 *php bc math 包含了：相加，比较，相除，相减，求余，相乘，n次方，配置默认小数点数目，求平方
 *这些函数在涉及到有关金钱的计算时比较有用
 ***************************************************************************************
 *两个高精度数比较
 *工作中遇到一种情况，0.00 ！= 0
 *int bccomp ( string $left_operand , string $right_operand [, int $scale ] )
 *$left=$right 返回 0
 *$left<$right 返回 -1
 *$left>$right 返回 1
 *$scale 小数点位数
 ***************************************************************************************/
$a = 4.45;
$b = 5.54;
if(bccomp($a, $b, 2) == 0)
{
}
/***************************************************************************************
 *两个高精度数相加
 *string bcadd ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale 返回的小数点个数
 ***************************************************************************************/
$a = 1.0321456;
$b = 0.0123456;
$c = bcadd($a, $b, 2);
//var_dump($c);
/***************************************************************************************
 *两个高精度数相减
 *sstring bcsub ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale 返回的小数点个数
 ***************************************************************************************/
$a = 1.0321456;
$b = 3.0123456;
$c = bcsub($a, $b, 2);
var_dump($c);
/********************************************************
 *两个高精度数求余/取模
 *string bcmod ( string $left_operand , string $modulus )
 *******************************************************/
$a = 6;
$b = 4;
$c = bcmod($a, $b);
//var_dump($c);
/***************************************************************************************
 *两个高精度数相除
 *string bcp ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************/
 $a = 6;
 $b = 5;
 $c = bcp($a, $b, 3);
 //var_dump($c);
/***************************************************************************************
 *两个高精度数相乘
 *string bcmul ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************/
$a = 3.1415926;
$b = 2.4569874566;
$c = bcmul($a, $b, 6);
//var_dump($c);
/***************************************************************************************
 *两个高精度数的次方值
 *string bcpow ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************/
$a = 3.1415926;
$b = 2;
$c = bcpow($a, $b, 3);
//var_dump($c);
/**************************************************
 *求高精度数的平方根
 *string bcsqrt ( string $operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************/
$b = bcsqrt($a, 6);
//var_dump($b);
/******************************
 *设置bc函数的小数点位数
 *bool bcscale ( int $scale )
 *$scale小数点位数默认为 0
 ******************************/
//bcscale();
?>

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