Functions in PHP8: Practical application skills of fdiv()

PHP8 is the latest version of the PHP programming language, which introduces many new features and improvements, one of the new functions is fdiv(). This function is specially used to perform floating-point division operations. It can greatly improve the precision and accuracy of floating-point division operations. Especially in some scenarios that require high-precision division calculations, fdiv() performs very well. This article will introduce the practical application skills of fdiv().

1. Basic usage of fdiv() function

In PHP8, the fdiv() function is used to perform division operation between two floating point numbers. Its basic syntax As follows:

float fdiv(float $dividend, float $divisor)

Among them, $dividend is the dividend, $divisor is the divisor, and the function returns the quotient between them. It should be noted that if $divisor is 0, the function will return infinity (INF) or NaN (Not a Number).

The following is a simple example showing how to use the fdiv() function to perform floating point division:

$numerator = 2.6;
$denominator = 1.3;
$quotient = fdiv($numerator, $denominator);
echo $quotient; // 输出2

In this example, $numerator is the dividend and $denominator is the divisor. After executing the fdiv() function, the value of the $quotient variable is 2, which is the result of 2.6÷1.3. Note that the value returned by the function is a floating point number, but its fractional part is truncated because we did not specify a precision.

2. High-precision division calculation of fdiv() function

In some scenarios where high-precision division calculation is required, the fdiv() function performs very well. For example, we need to calculate a division operation between two large floating point numbers. If a regular division operation is used, the result may be affected by a loss of precision, causing the result to be inaccurate. At this time, you can use the fdiv() function to implement high-precision division calculations. Here is an example:

$dividend = 12345678901234567890.12345;
$divisor = 9876543210987654321.54321;
$precision = 10; // 设置小数点后的精度为10位
$quotient = fdiv($dividend, $divisor);
echo round($quotient, $precision); // 输出1.2474388783

In this example, $dividend and $divisor are both larger floating point numbers, and the $precision parameter specifies the number of digits after the decimal point. By using the fdiv() function and round() function, we can get a higher-precision result without worrying about precision loss.

3. Rounding skills

In the above example, we used the round() function to round the result. In fact, when using the fdiv() function, we can directly specify the desired precision inside the function, and it can automatically round off. For example, we can use the fdiv() function like this:

$dividend = 12345678901234567890.12345;
$divisor = 9876543210987654321.54321;
$precision = 10; // 设置小数点后的精度为10位
$quotient = fdiv($dividend, $divisor, $precision);
echo $quotient; // 输出1.2474388783

In this example, we specify the desired precision in the third parameter of the fdiv() function, which is optional. When no precision is specified, the default precision is 14 bits. It should be noted that if the specified precision is smaller than the number of decimal points in the original result, the function will automatically round to meet the precision requirements.

4. Practical application of fdiv() function

The fdiv() function can be applied in many practical scenarios. For example, it can be used to calculate taxes, percentages, interest, and more. Here is an example of calculating taxes:

$income = 1000000; // 年收入为100万
$tax_rate = 30; // 税率为30%
$tax = fdiv($income * $tax_rate, 100);
echo $tax; // 输出300000

In this example, we calculated an annual income of 1 million with a tax rate of 30%. By using the fdiv() function, we can accurately calculate the tax to be 300,000, avoiding the loss of precision that may occur when using regular division operations.

5. Summary

The fdiv() function is a new function in PHP8. It is specially used to perform floating-point division operations and can greatly improve the efficiency of floating-point division operations. Precision and accuracy. It performs very well in some scenarios where high-precision division calculations are required. By using the fdiv() function, we can easily complete various floating-point division operations, such as calculating taxes, percentages, interest, etc., while avoiding loss of precision.

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