php null values on bind_result - php

Question

I have this PHP file stored i a server. It creates a new user for the DB. The registration is success but the response message is always NULL.
Here is my register.php file where i post the values
<?php
require_once 'DB_Functions.php';
$db = new DB_Functions();
// json response array
$response = array("error" => FALSE);
if (($_POST['name']) && ($_POST['surname']) && ($_POST['email']) && ($_POST['password']) && ($_POST['telephone'] && ($_POST['country']) ) )
{
// receiving the post params
$name = $_POST['name'];
$surname = $_POST['surname'];
$email = $_POST['email'];
$password = $_POST['password'];
$telephone = $_POST['telephone'];
$country = $_POST['country'];
// check if user is already existed with the same email
if ($db->isOwnerExisted($email)) {
// user already existed
$response["error"] = TRUE;
$response["error_msg"] = "User already exists with " . $email;
echo json_encode($response);
} else {
// create a new user
$user = $db->storeOwner($name, $surname, $email, $password, $telephone, $country);
if ($user) {
// user stored successfully
$response["error"] = FALSE;
$response["oid"] = $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 failed to store
$response["error"] = TRUE;
$response["error_msg"] = "Unknown error occurred in registration!";
echo json_encode($response);
}
}
} else {
$response["error"] = TRUE;
$response["error_msg"] = "Required parameters are missing!";
echo json_encode($response);
}
?>
And the storeOwner function
public function storeOwner($name, $surname, $email, $password, $telephone, $country) {
$hash = $this->hashSSHA($password);
$encrypted_password = $hash["encrypted"]; // encrypted password
$salt = $hash["salt"]; // salt
$stmt = $this->conn->prepare("INSERT INTO owner (oid, name, surname, country, email, password, salt, telephone) VALUES(?, ?, ?, ?, ?, ?, ?, ?)");
$stmt->bind_param("isssssss", $oid, $name, $surname, $country, $email, $encrypted_password, $salt, $telephone);
$result = $stmt->execute();
$stmt->close();
// check for successful store
if ($result) {
$stmt = $this->conn->prepare("SELECT * FROM owner WHERE email = ?");
$stmt->bind_param("s", $email);
$stmt->execute();
$user = $stmt->bind_result($user['oid'], $user['name'], $user['surname'], $user['country'], $user['email'], $user['password'], $user['salt'], $user['telephone']);
while ($stmt->fetch()) {
//printf("%s %s\n", $email, $password);
}
$stmt->close();
return $user;
} else {
return false;
}
}
The output is something like
{"error":false,"uid":null,"user":{"name":null,"surname":null,"country":null,"email":null,"password":null,"telephone":null}}
Why is every field null?

Answer 1

When you're fetching the user, you're currently overwriting the bound results with the response from that method:
$user = $stmt->bind_result($user['oid'], ...);
The method $stmt->bind_result() returns a boolean (true on success and false on error). So your code first sets the values and when that's done, it overwrites them with the result from the method (the boolean).
It should be:
$user = []; // You should create the array before using it.
$stmt->bind_result($user['oid'], ...);