09.Divide by 2 and 9

<!doctype html>
<html>
<head>
    <title>09.Divide by 2 and 9</title>
        <meta charset="windows-1251"/>
</head>
<body>
<h2>Дали числото се дели на 2 и 9?</h2>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="get">
Въведете число: <input type="text" name="number" size="20">
<input type="submit" name="send" value="OK">
</form>
<?php
if(isset ($_GET['send'])){
    $number = $_GET['number'];
    $div2 = $number%2;
    $div9 = $number%9;
        if(is_numeric($number) && $div2==0 && $div9==0 && $number<>0){
            echo $number." True";
        }
        else if(is_numeric($number) && $div2=!0 && $div9!=0 || $number==0){
            echo $number." False";
        }
        else{
            echo "Въведената стойност не е число. Моля въведете число";
        }
}
?>
</body>
</html>