Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>First Steps Into PHP</title>
</head>
<body>
<?php
for($i = 0; $i<9; $i++){
    for ($k = 0; $k<5; $k++){
        $color = "buttonface";
        $num = 0;
        if (($i ==0 || $i == 4 || $i == 8)|| ($i<4 && $k == 0) ||($i >4 && $k == 4)){
            $color = "blue";
            $num = 1;
        }?>
        <button style="background:<?=$color ?>"><?= $num ?></button>
    <?php } ?>
    <br>
<?php }
?>
</body>
</html>