user_id   | login         | email
 ---------- | ------------- | ------------
  1         | AD1          | email1@email.com
  2         | AD2          | email2@email.com

id        | user_id       | dtfrom       | dtto
 ---------- | ------------- | ------------   ------------
  1         | AD1           | 2017-12-12   | 2017-12-12
  2         | AD1           | 2017-12-13   | 2017-12-13
  3         | AD2           | 2017-12-20   | 2017-12-20

{
    "login":"AD1",
    "email":"email1@email.com",
    "movement":
        [
            {
                "dtfrom":"2017-12-12",
                "dtto":"2017-12-12"
            },
            {

                "dtfrom":"2017-12-13",
                "dtto":"2017-12-13"
            }
        ]
}

{
    "login":"AD1",
    "email":"email1@email.com",
    "0":
        {
            "dtfrom":"2017-12-12",
            "dtto":"2017-12-12"
        },
    "1":
        {
            "dtfrom":"2017-12-13",
            "dtto":"2017-12-13"
        }
}

<?php
    $connect = mysqli_connect("", "", "", "");
    global $connect;
    if (isset($_POST['login']))
    {
        $login = $_POST['login'];

        $sql = "SELECT * FROM users WHERE login='$login'";
        $result = mysqli_query($connect, $sql);
        if ($result && mysqli_num_rows($result) > 0) {
            while ($row = mysqli_fetch_array($result)) {
                $login_db = $row['login'];
                $email_db = $row['email'];

                $output = array('login' => $login_db, 'email' => $email_db);

                $sql2 = "SELECT * FROM movement WHERE user_id='$login_db'";
                $result2 = mysqli_query($connect, $sql2);
                if ($result2 && mysqli_num_rows($result2) > 0) {
                    while ($row2 = mysqli_fetch_array($result2)) {
                        $dtfromdb = $row2['dtfrom'];
                        $dttodb   = $row2['dtto'];

                        $output[] = array('dtfrom'=> $dtfromdb,'dtto'=> $dttodb);

                    }
                } else {}
            }
            echo json_encode($output);
        mysqli_free_result($result);
        }
        else { echo 'not found'; }
    }
?>