How to implement addition, subtraction, multiplication and division in php function

How to implement addition, subtraction, multiplication and division by PHP functions: 1. bcadd function, used for addition calculation of two arbitrary precision numbers, the syntax is "bcadd($num1, $num2, $scale)"; 2. bcsub Function, used for subtraction of two arbitrary precision numbers, the syntax is "bcsub($num1, $num2, $scale)"; 3. bcmul function, used for multiplication of two arbitrary precision numbers; 4. bcdiv function, used for Computes the division of two arbitrary-precision numbers.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How do PHP functions implement addition, subtraction, multiplication and division?

Example

$a = 1; $b = 3 ;$c = 2.3
$a *$b *$c 的结果可能变成 6.8999999999999995

bcadd — Addition of two arbitrary-precision numbers

//对 $num1 和 $num2 求和。
bcadd($num1, $num2, $scale)
//参数
//$num1
//左操作数，字符串类型。
//$num2
//右操作数，字符串类型。
//$scale
//设置结果中小数点后的小数位数。如果未设置，则默认为 0。
//返回值
//以字符串返回两个操作数求和之后的结果。

bcsub — Subtraction of two arbitrary-precision numbers

//$num1 减去 $num2。
bcsub($num1, $num2, $scale)
//参数
//$num1
//字符串类型的左操作数。
//$num2
//字符串类型的右操作数。
//$scale
//此可选参数用于设置结果中小数点后的小数位数。如果未设置，则默认为 0。
//返回值
//以 string 类型返回减法之后的结果。

bcmul — Multiplication calculation of two arbitrary-precision numbers

//≈num1 乘以 $num2。
bcmul($num1, $num2, $scale)
//参数
//$num1
//字符串类型的左操作数。
//$num2
//字符串类型的右操作数。
//$scale
//此可选参数用于设置结果中小数点后的小数位数。如果未设置，则默认为 0。
//返回值
//返回字符串类型的结果。

bcdiv — Division calculation of two arbitrary-precision numbers

//$num1 除以 $num2。
bcdiv($num1, $num2, $scale)
//参数
//$num1
//被除数，字符串类型。
//$num2
//除数，字符串类型。
//$scale
//此可选参数用于设置结果中小数点后的小数位数。如果未设置，则默认为 0。
//返回值
//返回字符串类型的结果。如果 $num2 是 0 结果为 null。

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