function odd($var)

{

    return($var & 1);

}

$num = 85;

if($num % 2 == 0){

echo "this is even number";

​

}else{

echo "this is odd number";

}

​

$number = 15;

if ($number % 1 == 0) {

    echo "It's even";

}else{

    echo "oneven";

}

<?php

for ($i=0; $i <=20 ; $i++) { 

if ($i % 2 == 0) {

    echo "$i";

    echo "<br>";

}}

?><br>

<?php

 for ($x=1; $x <=20; $x++){

     if ($x%2 != 0) {

         echo "$x";

         echo "<br>";

     }

 }

?>