`mysqli_real_escape_string`은 SQL 주입을 방지하기에 충분합니까?

  $email= mysqli_real_escape_string($db_con,$_POST['email']);
  $psw= mysqli_real_escape_string($db_con,$_POST['psw']);

  $query = "INSERT INTO `users` (`email`,`psw`) VALUES ('".$email."','".$psw."')";

switch ($sortby) {
    case 'column_b':
    case 'col_c':
        // Safe to use
        break;
    default:
        $sortby = 'rowid';
}

$start = (int) $start;
$howmany = (int) $howmany;
if ($start < 0) {
    $start = 0;
}
if ($howmany < 1) {
    $howmany = 1;
}

// Execute the query using prepared statements
$stmt = $db->prepare(
    "SELECT * FROM table WHERE col = ? ORDER BY {$sortby} ASC LIMIT {$start}, {$howmany}"
);
$stmt->execute(['value']);
$data = $stmt->fetchAll(PDO::FETCH_ASSOC);

$db->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);