How to divide and round in php

With the development of computer programming, we may encounter scenarios where we need to perform division operations and rounding in our daily programming work. In PHP programming, we can use different methods to achieve this purpose.

The following is a detailed introduction to the division and rounding method in PHP:

1. Use the functions that come with PHP

In PHP , we can use the built-in functions floor and ceil to implement division and rounding operations.

1. floor function

The floor function rounds the parameter value down to the nearest integer. If the parameter is a positive number, the decimal part is removed directly; if the parameter is a negative number, its absolute value is rounded up and then inverted, and the final result is the result of rounding down.

The sample code using the floor function is as follows:

$num1 = 5.6;
$result1 = floor($num1);
echo $result1;    //输出5

$num2 = -8.9;
$result2 = floor($num2);
echo $result2;    //输出-9

2. ceil function

The ceil function is used to round the parameter value up to the nearest integer . If the parameter is a positive number, its absolute value is rounded up; if the parameter is a negative number, the decimal part is directly removed, and the final result is the result of rounding up.

The sample code for using the ceil function is as follows:

$num1 = 5.6;
$result1 = ceil($num1);
echo $result1;    //输出6

$num2 = -8.9;
$result2 = ceil($num2);
echo $result2;    //输出-8

2. Using mathematical operators

In addition to using the functions that come with PHP, we also You can use mathematical operators to perform division and rounding operations.

Using a single slash (/) is a way to get exact results when performing division operations. However, if we want to round the result of the division operation, we need to use the integer divisor ("//" or "%").

Among them, "//" means rounding down (or integer division), and "%" means seeking remainder (or modulo).

The sample code for using mathematical operators is as follows:

$num1 = 5.6;
$result1 = $num1 // 1;
echo $result1;    //输出5

$num2 = -8.9;
$result2 = $num2 // 1;
echo $result2;    //输出-9

3. Use custom functions

In addition to the above two methods, we can also Customize a function to implement division and rounding operations.

The following is a custom function that simply implements division and rounding:

function divideRound($numerator, $denominator) {
    if ($denominator == 0) return false; //判断分母是否为0
    $negative = ($numerator < 0) != ($denominator < 0); //判断结果是否为负数
    $numerator = abs($numerator);
    $denominator = abs($denominator);
    $result = ($negative ? -1 : 1) * floor($numerator / $denominator); //计算结果
    return $result;
}

Then you can call this function to implement division and rounding:

$num1 = 5.6;
$den1 = 1;
$result1 = divideRound($num1, $den1);
echo $result1;    //输出5

$num2 = -8.9;
$den2 = 1;
$result2 = divideRound($num2, $den2);
echo $result2;    //输出-8

Summary:

There are many ways to implement division and rounding in PHP, and you can choose the most suitable method according to actual needs. Division and rounding can be easily and quickly implemented using the built-in functions. Mathematical operators can also provide accurate results and quickly implement operations, while custom functions can meet more complex needs.

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