How to determine if two numbers are divisible in php

In PHP, you can use the "%" and "==" operators to determine whether two numbers are divisible; you only need to use the "%" operator to divide the two numbers to get the remainder, and then use The "==" operator can be used to determine whether the obtained remainder is 0. The syntax is "Number 1 % Number 2 == 0". If it is 0, it can be divisible. If it is not 0, it cannot be divisible.

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

To determine whether two numbers are divisible, you can put it another way, It is to determine whether the remainder of dividing two numbers is 0.

In PHP, you can use the "%" and "==" operators to determine whether two numbers are divisible.

• "%" is the remainder operator, which can divide two operands and obtain the remainder.

• "==" is an equality operator that compares and tests whether the variable (expression or constant) on the left has the same value as the variable (expression or constant) on the right .

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$num1=8;
$num2=2;
if($num1 % $num2 == 0){
	echo "$num1 和 $num2 ，两个数能整除";
}else{
	echo "$num1 和 $num2 ，两个数不能整除";
}
?>

##Extended knowledge: arithmetic operators and comparison operators

Arithmetic operators

Arithmetic operators are a set of symbols often used to process four arithmetic operations, namely: " ", "-", "*" "/ ""%" and so on; when processing numbers, most arithmetic operators are used.

ExampleNameResult-a negates the negative value of a bSubtractionamultiplicationaDivisionModulo (remainder of division) Find the exponentiation

##a.

Addition

##a and ## The sum of #b. a - b

and b difference. a * b

and# The product of ##b. a / b

a

divided by b’s quotient. a % b

a

The remainder after dividing b. a ** b

a

bThe value of the power. Introduced in PHP 5.6 version.

The division operator always returns a floating point number. The only exception is the following:

• Both operands are integers (or integers converted from strings) and are exactly divisible, in which case it returns an integer.

The operands of the remainder operator will be converted to integers (except for the decimal part) before operation.

The result of the remainder operator % is the same as the sign (positive or negative sign) of the dividend. That is, the result of $a % $b has the same sign as $a.

Comparison Operators

Comparison operators, as their name implies, allow two values ​​to be compared.

When an operator is used to compare two values, the result is a logical value, either TRUE (true) or FALSE (not true).

The comparison operators in PHP are shown in the following table:

Comparison operators

Example	Name	Result
$a == $b	is equal to	true, if $a is equal to $b after type conversion.
$a === $b	Congruent	true, if $a is equal to $b, and they are also of the same type.
$a != $b	Not equal	true, if after type conversion$a is not equal to $b.
$a $b	Not equal	true, if type conversion After $a is not equal to $b.
$a !== $b	not congruent	true, if $a is not equal to $b, or they are of different types.
$a	is less than	true, if $a is strictly less than $b.
$a > $b	is greater than	true, if $a is strictly greater than $b.
$a	is less than or equal to	true, if $a is less than or equal to $b.
$a >= $b	is greater than or equal to	true, if $a is greater than or equal to $b.
$a $b	Spaceship operator (combination comparison operator)	When$a is less than , equal to or greater than $b Returns a int value that is less than, equal to, or greater than 0 respectively.
$a ?? $b ?? $c	NULL merge operator	The first one from left to right that exists and is not NULL Operands. If neither is defined and is not NULL, NULL is returned. Available starting with PHP7.

Recommended study: "PHP Video Tutorial"

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