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AJAX PHP - response is an object with null values

I have a small problem maybe because i am a beginner in ajax programming, i make a function in ajax jquery that calls a php file, which makes a request to the database for informations about a player. When the php file replies to the ajax function, i get an object with null values as an answer.
Is there a line i've missed in my code? or something i forgot to do?
Here is my code,
AJAX function:
$.ajax({
method: 'GET',
url: "webservices/get_infos.php",
timeout: kTimeout,
success: function(response) {
alert(response);
},
error: function() {
alert('error');
}
});
And the php file :
<?php
include("connexion_bdd.php");
$_GET['mail'] = $mail;
$req = $bdd->prepare('SELECT * FROM joueurs WHERE mail = ?');
$req->execute(array($mail));
$reponse = $req->fetch();
$return = array();
$return["user_name"] = $reponse["nickname"];
$return["profile_pic"] = $reponse["profile_pic"];
$return["user_id"] = $reponse["id"];
print(json_encode($return));
?>
In the success of the ajax function, i get this :
{"user_name":null,"profile_pic":null,"user_id":null}
Although the database is not null.
Where do you think is my mistake? php file or ajax function? or both?
Thanks for helping :)
Edit :
I've changed my code according to the remarks i had on the way i pass the variable AJAX->PHP.
I've tested my sql query on my database and it works fine, but i still have the problem of null values after i pass the object from my php file to the succes function of the AJAX/JS file.
Any ideas about what's wrong with my code?
Thanks again.

You have two problems here.
First, you are not sending the mail parameter in your jQuery AJAX request. You need to append the GET parameter to the end of the URL under the url key:
$.ajax({
method: 'GET',
url: "webservices/get_infos.php?mail=youremail#gmail.com",
timeout: kTimeout,
success: function(response) {
alert(response);
},
error: function() {
alert('error');
}
});
The second problem is that you have your $mail variable assignment in your PHP script backwards. It should be
$mail = $_GET['mail'];
$_GET['mail'] is automatically set by PHP when you call the script with a GET request. But since you are referencing $mail in your prepared SQL statement, you want to assign the value of $_GET['mail'] to $mail.

unable to get the data value of ajax on another page

I'm trying to update the user votes into database. This below ajax codes returns correct rating datas. But, I'm unable to get the alert data on another page. In my car_user_rating.php page I have tried this echo $post_rating = $_POST['performance_rating'];. But it doesn't get the performance_rating data value.
I have checked my console. It returns the rating values (4). I'm confused why it doesn't get the data value?
ajax request
$(function () {
$('#form').on('submit', function (e) {
performance_rating = $('input:radio[name=rating]:checked').val();
e.preventDefault();
$.ajax({
type: 'POST',
url: "<?=CAR_USER_RATINGS?>",
data: { performance_rating: performance_rating },
success : function(data){
alert(performance_rating)
},
});
});
});

you should alert the data which you pass in success: function()
like
success : function(response){
alert(response);
},

use 'var' in submit handler, may it's because of scope:
var performance_rating = $('input:radio[name=rating]:checked').val();

I am not sure of your context so cant say exactly. Also i dont know if you are using exact same code as above or you have written teh above code in a hurry since there are mistakes there!!!
However Firstly try these
data: { "performance_rating": performance_rating },
url: "<?php=CAR_USER_RATINGS?>" //you have forgotten php
success : function(data, testStatus, xhr){
},
and check each values of data, testStatus, xhr
Also what is the value of
performace_Rating before $.ajax
"<?php=CAR_USER_RATINGS?>" before $.ajax

Just to summarize. I could figure out from your comment that your php is as below:
no. I have this codes on my php page inside the body tag
<?php echo $post_rating = $_POST['performance_rating'];
/*var_dump($get_rating); echo $sql = "UPDATE ".TBL_CAR_USER_RATINGS." SET performance = '$get_rating' WHERE model_id = '2'"; die(); mysql_query($sql, $CN) or die(mysql_error()); */ ?>
This is present inside the body tag!!! Well if you are using body tag i presume you are using other html, header(optional) tags as well
For a ajax response page the reply to client should "ONLY" be the value you want to send back.
Having tags will result in the the ajax response containing these tags as well.
So if you want your ajax page to return performance rating do the below:
//car_return_Rating.php
<?php echo $_POST['performance_rating']; ?>
If you have below code your response is shown below
//car_Return_rating.php
<html>
<body>
<?php echo $_POST['performance_rating']; ?>
</body>
</html>
then response i.e. data in success(data){}
will be equal to
data = "<html><body>4</body></html>"; //assuming 4 to be equal to $_POST['performance_rating'];

Function returns JSONP. How to display as JSON - Javascript/jQuery

I am working with an API from another website and I am trying to get a JSON object back. Unfortunately due to the site origin issue I have to use JSONP to retrieve my data.
The function is working but I am stack on how to sanitize the data coming as a JSONP format to be able to use it as JSON?
This is my function
$('.loginForm').click(function(){
var url = 'https//api.example.com';
$.ajax({
type:'GET',
url: url,
dataType: 'jsonp',
error: jsonpCallback,
success: jsonpCallback,
jsonp: "callback"
});
function jsonpCallback(response){
console.log(response);
}
});
EDIT
This is the response I get before the error
Object { readyState=4, status=200, statusText="success", more...}
And this is the error i'm getting
SyntaxError: missing ; before statement
{"accountID":1328031,"authToken":"D81CDCB......
I went through every post in SO and the web in general to find where I am making a mistake but so far I can't find anything.

If you are getting the response in jsonP then you can use jXHR for making cross domain request , below is the link of jXHR (Library) :
https://gist.github.com/1576277/f4aead6741e0d7b0c40db6601048d9db6be1a5f9
And here is an example to use jXHR :
function sendRequest()
{
var xhrReq = new jXHR();
xhrReq.onreadystatechange = function(data)
{
if (xhrReq.readyState === 4)
{
//data contains your jsonp response..
}
};
var url = "http://" + SERVER_NAME + "yourCodeFile.aspx?callback=?";
xhrReq.open("GET",url);
xhrReq.send();
}
Always remember to add 'callback=?' as a query string parameter in url for jXHR request as the respone is jsonP.
Hope this helps you.

try using JSON.parse
function jsonpCallback(response){
console.log(JSON.parse(response));
}

GetJson jquery doesn't run success action

I'm using this code to make an Ajax request to a JSON file:
var queries = $("#myform").serialize();
$.getJSON("/files/json.php?" + queries,
function(data){
alert(data);
}
);
But it returns no errors and the alert is not performed. The PHP files send data using the
header('Content-type: application/json');
And if I open the same query within direct URL it returns the JSON data, so the problem is jQuery.
The network tab shows:
json.php?(my queries parameters and values)
/files
GET
200
OK
application/json
jquery.js:9597
How can I fix this problem?

Try this,
var queries = $("#myform").serialize();
$.getJSON("/files/json.php", queries,
function(data){
alert(data);
});
Second parameter for getJSON is actually form data which you have to pass to the php page

Both .getJSON() and .ajax() not working for REST API call

Can someone explain me how to make a REST call using jQuery/Javascript? I tried using the .getJSON() and .ajax(), but neither helped me.
This is the REST URL :
http://ws1.airnowgateway.org/GatewayWebServiceREST/Gateway.svc/forecastbyzipcode?zipcode=94954&date=2010-01-15&format=json&key=API_KEY
Code:
$.getJSON('http://ws1.airnowgateway.org/GatewayWebServiceREST/Gateway.svc/forecastbyzipcode?zipcode='+zip+'&format=json&key=**<KEY HERE>**',
function(data)
{
alert(data.AQI);
}
);
$.ajax({
url: 'http://ws1.airnowgateway.org/GatewayWebServiceREST/Gateway.svc/forecastbyzipcode',
type: 'GET',
data: 'zipcode='+zip+'&format=json&key=**<KEY HERE>**',
success: function() { alert('get completed'); }
});

there are a couple of problems. First, you need to add &callback=? to the end of the querystring to allow the crossdomain.
$.getJSON('http://ws1.airnowgateway.org/GatewayWebServiceREST/Gateway.svc/forecastbyzipcode?zipcode=94954&format=json&key=B868EA39-1D92-412A-96DE-DCF5ED30236D&callback=?',
function(data)
{
alert(data.forecast[0]);
}
);
You will then get an Uncaught SyntaxError: Unexpected token : error. This is because you are expecting json data, but the headers on the server are sending text/html - not application/json. Take a look at the console when you run this fiddle, you'll see the errors.
Therefore, you can't get the data from cross domain because you have to be using jsonp - which requires the header to be sent correctly.
If this is your api, then you just need to send the correct header, otherwise, you need to get with the developers there and ask them to fix it.
Alternatively
If neither of those above options work, you could always create a proxy script that would get the contents of the json feed for you and echo it out. Here's one in PHP:
<?php
// myproxy.php
header('Content-type: application/json');
$zip = $_GET['zip'];
$results = file_get_contents('http://ws1.airnowgateway.org/GatewayWebServiceREST/Gateway.svc/forecastbyzipcode?zipcode=' . $zip . '&format=json&key=B868EA39-1D92-412A-96DE-DCF5ED30236D');
echo $results;
?>
Then, you would just point your $.getJSON to this script on your server:
$.getJSON('/myproxy.php?zip='+zip,
function(data)
{
var mydata = jQuery.parseJSON(data);
alert(mydata.forecast[0]);
}
);