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Check if a number is odd or even

Using PHP's bitwise And operator (&), we can check to see if the 1-bit is on or off. If it's on, we have an odd number, otherwise, an even number. We can also accomplish the task by using the modulus operator.

<?php
$number = 35;
if($number & 1) {
echo "$number is odd"; // sure enough
} else {
echo "$number is even";
}
// or... you can do it another way:
// Per micro5033's comment, the modulous operator (%) returns the remainder of a division.
// The remainder of any even integer that is divided by two will always be zero. PHP
// will conveniently interpret 0 as false and any non-zero as true, so...
if($number % 2) {
echo "$number is odd";
} else {
echo "$number is even";
}
?>

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