/* page access */

$page_access = ['admin','reseller'];
if (!in_array($_SESSION['user_role'], $page_access)) {
	// $user cannot access this page, I should give warning or redirect to somewhere else
	// die('Error: Unauthorized Access');
}

/* data access */

function get($data_id) {
	if ($_SESSION['user_role'] == 'admin') {
		$sql = "SELECT * FROM 'table' WHERE `data_id` = {$data_id}";
	}
	if ($_SESSION['user_role'] == 'user') {
		$sql = "SELECT * FROM 'table' WHERE $username = '" . $_SESSION['username'] . "' AND `data_id` = {$data_id}";
	}
}