For Even and Odd values:

<html>
<head><title>Even & Odd using Gettype </title></head>
<body>
<form action="evenoddget.php" method="POST">
Plese enter a number</b>
<input type="text" name="number" /> <br />
<input type="hidden" value="true" name="post" />
<input type="submit" value="Submit" />
<br />
<br />
<br />
<?php
if ($_POST ['post']){
$num = $_POST ['number'];
$a=$num/2;
if (gettype($a)==double){
echo "<h3>$num</h3><h2> ODD Number </h2> &nbsp " . "<br />";
}
else {
echo "<h3>$num</h3><h2> EVEN Number </h2> &nbsp " . "<br />";
}

}
?>
</form>
</body>
</html>