cannot store session values from json object - php

Question

I am reading values from database and would like to store the values as a session object to be reused by the code. however, the code executes fine but does not store any values in the session storage.
JS code
$.getJSON("sessionstore.php", {"points": myjson}, function(data){
sessionStorage.user = data[0];
sessionStorage.usermail = data[2];
sessionStorage.supmail = data[4];
sessionStorage.repsupervisor = data[3];
sessionStorage.issupervisor = data[5];
});
php code
<?php
include 'mydbconn.php';
if (isset($_POST["points"])) {
$points = json_decode($_POST["points"]);
}
// decode the json data that is being passed
$usrname = $points->usrname;
$sql = "Select EmpName, EmpMail, RepSupervisor, SupMail, IsSupervisor from glusers where EmpName='$usrname'";
$result = $conn->query($sql);
$data = array();
while($row = $result->fetch_assoc()){
$data[] = $row;
};
echo $data[0];
die();
?>
There are no errors but the code does not execute.
Regards,

Answer 1

You are not outputting valid json. Note that $data[0] is a row of your result set - an array - so when you echo it in php you will output something like Array.
You need to change:
echo $data[0];
die();
to:
echo json_encode($data[0]);
die();
Edit: Also, you are fecthing associative arrays, so you would need to address them in your javascript as:
data.EmpName
data.EmpMail
// etc.