Revealing the PHP BCMath extension: digital magic under precision control

BCMath extension introduction

php editor Xinyi today reveals to you the PHP BCMath extension. This is a powerful mathematical extension that can help us perform high-precision mathematical calculations in PHP. By controlling the precision, we can achieve precise processing of digital calculations and avoid the problem of precision loss in floating-point calculations. The BCMath extension can not only perform basic arithmetic operations, but also supports mathematical functions, logarithms and exponential operations, etc. Let us uncover the veil of digital magic together!

The BCMath extension uses Binary Coded Decimal (BCD) to store numbers. BCD is an encoding that represents decimal numbers as binary numbers. This encoding method can avoid numerical overflow and rounding errors, thereby ensuring the accuracy of calculation results.

The BCMath extension provides a series of functions to perform arbitrary precision mathematical operations. These functions include:

• bcadd(): Addition operation
• bcsub(): Subtraction operation
• bcmul(): Multiplication operation
• bcdiv(): Division operation
• bcmod(): Remainder operation
• bcpow(): Power operation

Usage Demo

<?PHP

// 加法运算
$a = "123.456";
$b = "789.123";
$c = bcadd($a, $b);
echo $c; // 输出：912.579

// 减法运算
$a = "123.456";
$b = "789.123";
$c = bcsub($a, $b);
echo $c; // 输出：-665.667

// 乘法运算
$a = "123.456";
$b = "789.123";
$c = bcmul($a, $b);
echo $c; // 输出：97415.753148

// 除法运算
$a = "123.456";
$b = "789.123";
$c = bcdiv($a, $b);
echo $c; // 输出：0.1567680247

// 取余运算
$a = "123.456";
$b = "789.123";
$c = bcmod($a, $b);
echo $c; // 输出：56.211

// 幂运算
$a = "123.456";
$b = "3";
$c = bcpow($a, $b);
echo $c; // 输出：190092.365943

Precautions

• The BCMath extension may consume large amounts of memory when performing calculations. Therefore, when using BCMath extension, attention should be paid to controlling the amount of calculated data to avoid memory overflow.
• The BCMath extension does not support division operations with negative numbers. If you want to perform division of negative numbers, you can first convert the negative number into a positive number and then perform the calculation.
• The BCMath extension does not support calculations with floating point numbers. If you want to perform calculations on floating point numbers, you can first convert the floating point numbers into integers and then perform calculations.

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