Clash Royale CLAN TAG#URR8PPP

What is the diffrent between using {%2B) instead of (+) before a number?

i was working on an api base on a tutorial which it was getting token from user to recognize that user is admin or not.

so it's just a question about is this really matter to use

+1xxx-xxxx-xxx


Or

%2B1xxx-xxxx-xxx


When i've tested my api it's returning null if i input wrong data in isServerToken, and if i use right one it's gonna return right value. but if i use + instead of [%2B] it's gonna get me this error :

+

[%2B]

<br />
<b>Notice</b>: Undefined variable: token in <b>/h**e/m***/pu**tml/***/db_functions.php</b> on line <b>389</b><br />
null


I'll comment 389 line in below

No matter if i use right or wrong input for isServerToken. It's gonna say top error.

I'm asking this because i'm getting error from my android about

java.langillegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $


so i'm considering every possibility about what is making this error happen. here are the codes for PHP API. In tutorial instructor used get_result, but I've changed it to bind_result because it won't work on my online host.

PHP API

here are the codes :

// Instructer Code
public function getToken($phone,$isServerToken)

$stmt = $this->conn->prepare("SELECT * FROM `token` WHERE phone=? AND isServerToken=?") or die ($this->conn->error);
$stmt->bind_param("ss",$phone,$isServerToken);
$result = $stmt->execute();
$token = $stmt->get_result()->fetch_assoc();
$stmt->close();
return $token;


// What i've changed to Bind
public function getToken($phone,$isServerToken)

$stmt = $this->conn->prepare("SELECT phone, token, isServerToken FROM `token` WHERE phone=? AND isServerToken=?") or die ($this->conn->error);
$stmt->bind_param("ss",$phone,$isServerToken);
$result = $stmt->execute();
$stmt->bind_result($arr['phone'], $arr['token'], $arr['isServerToken']);
while ($stmt->fetch())

$token = $arr;

$stmt->close();
return $token; => This is where `Undefined variable: token in` happen.



And app calling from this part :

//Only instructor code, i didn't changed anything this part
if(isset($_POST['phone']) && isset($_POST['isServerToken']))

$userPhone = $_POST['phone'];
$isServerToken = $_POST['isServerToken'];

$token = $db->getToken($userPhone,$isServerToken);

echo json_encode($token);



else
$response = "Required parameter (phone , isServerToken) is missing!";
echo json_encode($response);



I want to make sure when use register with +xxxx-xxxx-xxx number is this making my api say top error or not, because as i said it's working fine with %2Bxxxx-xxxx-xxx.

Also number is saving with + in database.

+

When I've line to this base on suggestions things got opposite now + work and 2%B will be null.
$token = $db->getToken(urlencode($userPhone),$isServerToken);

+

2%B

Thanks

1 Answer
1

In your second function declaration of getToken, the variable $token will never be created, if the while construction isn't being looped (as you are declaring $token online inside the loop).

getToken

$token

while

$token

So, possible outcome is that the variable $token just don't exists at the moment of returning $token (which is what you are experiencing). In other words, there aren't any results being looped in your case.

$token

$token

Also: Plus-signs aren't a good match within JSON:
https://stackoverflow.com/a/1374456/5682311

Using php's urlencode function on the phonenumber (or any value) before parsing it to json_encode, sounds like the solution (which will transform the + sign into %2B)

urlencode

json_encode

+

%2B

edit:

public function getToken($phone,$isServerToken)

$stmt = $this->conn->prepare("SELECT phone, token, isServerToken FROM `token` WHERE phone=? AND isServerToken=?") or die ($this->conn->error);
$stmt->bind_param("ss",$phone,$isServerToken);
$result = $stmt->execute();
$stmt->bind_result($arr['phone'], $arr['token'], $arr['isServerToken']);

$token = array(); // <- added this line, to be sure variable $token always exists
while ($stmt->fetch())

$token = array_map('urlencode', $arr ); // <- urlencode all values within $arr

$stmt->close();
return $token;



+

%2B

$token = $db->getToken(urlencode($userPhone),$isServerToken);

getToken

getToken

json_encode

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