How to achieve integer division with remainder in php

PHP is a widely used open source server-side scripting language for the development of web applications. One common programming task is performing calculations on numeric values, including remainders and divisions. In PHP, these calculations can be achieved through various arithmetic operators.

In PHP, there are two methods to achieve remainder and integer division. These two methods are the modulo operator (%) and the integer division operator (/).

1. Modulo operator (%)

The modulo operator (%) is used to calculate the remainder after dividing two numbers. It is a common numerical calculation operation. In PHP, the modulo operator (%) can be used to perform remainder operations, for example:

$a = 10;
$b = 3;
$c = $a % $ b; //The remainder is 1

The remainder of dividing $a by $b is 1. Different from other languages, PHP will handle it specially when performing % operation on negative numbers. If it is assumed that a is a negative number and b is a positive number, then we can convert the remainder into an integer in the following way:

$c = ($a % $b $b) % $b; //The remainder is 2

If we do not perform the above conversion operation, the resulting remainder will be a negative number. Because for integer division of $a and $b, the result is -3 with a remainder of 1, and this remainder is a negative number. In order to find the remainder of a positive number, you need to use the conversion method described above.

2. Integer division operator (/)

Contrary to the modulo operator (%), the integer division operator (/) is used to calculate the integer quotient after dividing two numbers. For example:

$a = 10;
$b = 3;
$c = $a / $b; // The result is 3.33

In this example, $ The result of dividing a by $b is 3.33. Here you can see that the integer division operator (/) is different from the modulo operator (%). Because the result of the integer division operator (/) does not take remainders into account, you will get a floating point number regardless of whether the result is an integer.

In addition to the above two methods, there are some other implementation methods. For example, use the floor function and the round function to perform rounding operations on floating point numbers.

For example, we can use the floor function to round down,

$a = 10.5;
$b = 3;
$c = floor($a / $b); // The result is 3

The result is 3. The result of using the floor function is the integer value obtained by rounding down.

Similarly, you can use the round function to round up or down. For example:

$a = 10.5;
$b = 3;
$c = round($a / $b); //The structure is 4

Here, round The return value of the function is the rounded integer value. If you require the opposite rounding function, you can pass parameter 2 to the round function, for example:

$a = 10.5;
$b = 3;
$c = round($a / $b, 0, PHP_ROUND_HALF_DOWN); // The result is 3

Here, the second parameter 0 indicates rounding to the nearest integer, and the third parameter PHP_ROUND_HALF_DOWN indicates rounding down.

In short, PHP provides a large number of arithmetic operators and functions for calculating numerical values. For remainders and integer divisions, developers can choose different methods to implement them based on specific needs. Choosing the correct method can improve the efficiency and readability of the code.

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