How to determine whether a number is even in php

In PHP, you can use the remainder operator "%" and the equality operator "==" to determine whether a number is even. The syntax is "value % 2 ==0". An even number is a number that is divisible by 2. You only need to use "%" to get the remainder of the specified number divided by 2, and then use "==" to determine whether the remainder is 0; if the remainder is 0, the number is an even number.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php determines a number Is it an even number

In PHP, if you want to determine whether a number is an even number, you only need to determine whether the number is divisible by 2.

In other words, it is the number that has a remainder of 0 when divided by 2.

Use the remainder operator "%" and the equality operator "==" to determine whether a number is divisible by 2, that is, whether it is an even number.

Implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
function f($num){
	if($num % 2 == 0){
		echo $num."是一个偶数<br>";
	}
	else{
		echo $num."不是一个偶数<br>";
	}
}
f(2);
f(3);
f(4);
f(5);
f(6);
?>

Description:

Remainder operator "%", used to find Remainder operation, find the remainder of division operation.

"%" mainly operates on integers, but also applies to floating point numbers. If the dividend ($a) is negative, the result obtained is also a negative value.

Equality operator "==", if the values ​​of $a and $b are equal after type conversion, it returns TRUE, otherwise it returns FALSE

Congruence operator "===", If $a and $b are not only equal in value, but also have equal types of values, then return TRUE, otherwise return FALSE

It is important to distinguish between "equal" and "congruent":

• Equal == only compares the values ​​​​of two variables

• Congruent=== not only compares the values ​​​​of the expressions on both sides of the operator, but also The data types will also be compared. Only when the values ​​and data types on both sides are equal, the operation result will be TRUE.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to determine whether a number is even in php. For more information, please follow other related articles on the PHP Chinese website!