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<?php
if (isUserAdmin()) {
    $isAdmin = true;
}
$data = validate_and_return_input($data);
switch ($action) {
    case 'add':
        addSomething($data);
        break;
    case 'delete':
        if ($isAdmin) {
            deleteSomething($data);
        }
        break;
    case 'edit':
        if ($isAdmin) {
            editSomething($data);
        }
        break;
    default:
}
?>