<?php
$servername = "localhost";
$username = "user";
$password = "user";
$dbname = "user";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
//Здесь все пашет отлично
if($_GET['method'] == 'login'){
     //return $_GET['var1'] + $_GET['var2'];
    $sqlLogin = "select id from customer where login='".$_GET['login']."' and password='".$_GET['password']."'";
    $sqlEmail = "select id from customer where email='".$_GET['login']."' and password='".$_GET['password']."'";
    $sqlTest = "select * from customer";

    $result = $conn->query($sqlLogin);
    if ($result->num_rows > 0) {
        while($row = $result->fetch_assoc()) {
            echo $row["id"];
        }
    } else {
        $resultMail = $conn->query($sqlEmail);
        if ($resultMail->num_rows > 0) {
            while($row = $resultMail->fetch_assoc()) {
                echo $row["id"];
            }
        }
    }
$conn->close();
}

// Таблицы order и customer находятся в одной БД метод login работает нормально. А вот getOrders не пашет
if($_GET['method'] == 'getOrders'){
    $sqlOrder = "select * from order where  id_client ='".$_GET['id']."' or id_executor='".$_GET['id']."'";
    $result = $conn->query($sqlOrder);
    $rows = array();
    if ($result->num_rows > 0) {
        echo "Works";
        while($row = $result->fetch_assoc()) {
            echo "id: " . $row["id"];
            $rows[] = $row;
        }
    }
    print json_encode($rows);
    $conn->close();
}