How Can I Check if a Number is Odd or Even in PHP?

Checking the Oddity/Evenness of a Number in PHP

Determining if a number is odd or even is a fundamental task in programming. In PHP, the mod operator, represented by the % symbol, provides a straightforward solution to this problem.

When a number is divided by two (using the % operator), the remainder is either 0 (indicating evenness) or a non-zero value (indicating oddness). Therefore, the following expression effectively tests for the number's parity:

$number % 2 == 0

If the remainder is 0, the number is even and the expression will return true. Otherwise, the number is odd, and the expression will return false.

Example Usage:

$number = 20;
if ($number % 2 == 0) {
  echo "The number $number is even.";
} else {
  echo "The number $number is odd.";
}

Output:

The number 20 is even.

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