PHP: Proper way to pass variables - php

Question

I have this piece of PHP code installed on a server where i have also installed a DataBase. When i try to run it via URL http://ptyxiaki2016.eu.pn/login.php?email=tade&password=1234 I got NULL to all the values.
tade 1234 {"error":false,"uid":null,"user":{"name":null,"surname":null,"country":null,"email":null,"password":null,"telephone":null}}
My PHP code is below:
<?php
require_once 'DB_Functions.php';
require_once 'DB_Connect.php';
$db = new DB_Functions();
// json response array
$response = array("error" => FALSE);
if (isset($_GET['email']) && isset($_GET['password'])) {
// receiving the post params
$email = $_GET['email'];
$password = $_GET['password'];
// get the user by email and password
$user = $db->getUserByEmailAndPassword($email, $password);
if ($user != false) {
// user is found
$response["uid"] = $user["oid"];
$response["error"] = FALSE;
$response["uid"] = $user["oid"];
$response["user"]["name"] = $user["name"];
$response["user"]["surname"] = $user["surname"];
$response["user"]["country"] = $user["country"];
$response["user"]["email"] = $user["email"];
$response["user"]["password"] = $user["password"];
$response["user"]["telephone"] = $user["telephone"];
echo json_encode($response);
} else {
// user is not found with the credentials
$response["error"] = TRUE;
$response["error_msg"] = "Login credentials are wrong. Please try again!";
echo json_encode($response);
}
} else {
// required post params is missing
$response["error"] = TRUE;
$response["error_msg"] = "Required parameters email or password is missing!";
echo json_encode($response);
}
?>
And this is the function getUserByEmailAndPassword() i call in the login. It is inside the DB_Functions.php I include.
public function getUserByEmailAndPassword($email, $password) {
$stmt = $this->conn->prepare("SELECT * FROM owner WHERE email = ?");
$stmt->bind_param("s", $email);
if ($stmt->execute()) {
$user = $stmt->bind_result($oid, $name, $surname, $country, $email, $password, $telephone);
while ($stmt->fetch()) {
printf("%s %s\n", $email, $password);
}
$stmt->close();
return $user;
}
}
What am I missing here? My DB is OK, but, how can i retrieve the data?

Answer 1

Error is here:
$user = $stmt->bind_result($oid, $name, $surname, $country, $email, $password, $telephone);
You bind result to variables ($oid, $name, ...), but return $user.
bind_result returns result of operation (true/false), but not result of query.
So result of call to getUserByEmailAndPassword() is bool value. If you'll run instead of echo json_encode($response) echo json_encode($user) you'll see it.
UPD: try this code instead of yours
if ($stmt->execute()) {
$stmt->bind_result($user["oid"], $user["name"], ...)
while ($stmt->fetch()) {
printf("%s %s\n", $email, $password);
}