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

echo $result;
exit;
?>

<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>