How can PHP developers efficiently determine if a number is always divisible by two without using loops or recursion?

To efficiently determine if a number is always divisible by two without using loops or recursion, we can use the modulo operator %. If a number is divisible by 2, the result of dividing it by 2 will have a remainder of 0.

function isDivisibleByTwo($number) {
    return $number % 2 === 0;
}

// Example usage
$number = 10;
if (isDivisibleByTwo($number)) {
    echo "$number is divisible by 2";
} else {
    echo "$number is not divisible by 2";
}