Checkboxes in a web form!

checkboxes.php

<form action="process.php" method="post">
    <input type="checkbox" name="flavours[]" value="strawberry">
    <input type="checkbox" name="flavours[]" value="vanilla">
    <input type="checkbox" name="flavours[]" value="chocolate">
    <input type="submit" value="Submit!">
</form>

process.php

<?php
if (isset($_POST['flavours'])) {
    $flavours = $_POST['flavours'];
}
$result = implode(",", $flavours);

echo $result;
exit;
?>