Best way to check for an even number

[youngp]

My question is the same as the title, what is the best way to check for an even or odd number?

[halojoy]

PHP Modulus operator is: %
See this page:
http://php.net/manual/en/language.operators.arithmetic.php

<?php

// PHP Modulus operator is: %

$num = 9;
echo $num;
echo '<br />';
if(!($num%2)) echo 'even';//can be perfectly divided by 2
if($num%2)    echo 'odd';

echo '<hr />';
if(!($num%3)) echo 'by3';//can be perfectly divided by 3
if($num%3)    echo 'not by3';

?>

[bradgrafelman]

An alternative would be to use a bitwise operator:

if($num & 1) { // number is odd
}