How to use session with angularJS and PHP backend -

i'm developing angularjs application php backend, implemented authentication step, , i'm trying display data of authenticated user in view after authentication.

i used session token display user data in other view if did read in tutorials sessions , tokens more 2 weeks, still can't display user data. , error in display.php file:

undefined index: token

how can manage problem?

login.php

<?php   session_start(); $data = json_decode(file_get_contents("php://input"));   $connect = mysqli_connect("localhost", "root", "", "database");     if(count($data) > 0)     {   $email=mysqli_real_escape_string($connect, $data->email); $password=mysqli_real_escape_string($connect, $data->password);  $query = 'select * `client` (emailclient = "'.$email.'" ,   password= "'.$password.'")';  $q = mysqli_query($connect , $query);  if(mysqli_num_rows($q) > 0 )   {         $token = md5($email.time()."51395+81519851");        $query = "update client set token = '".$token."' emailclient = '".$email."'";        mysqli_query($connect , $query);        $_session["logged_in"] = true;         $_session["token"] = $token;         $result['message'] ='logged in';        $result['email'] =$email;        $result['token'] = $token;         $resultstring=json_encode($result);        $resultstring=str_replace("null", '""', $resultstring);        echo $resultstring;        exit;   }         $result['message'] ='the username or password incorrect!';  $resultstring = json_encode($result); $resultstring = str_replace("null",'""',$resultstring); echo $resultstring; exit; }  ?> 

display.php

<?php   session_start();  $connect = mysqli_connect("localhost", "root", "", "database");     $output = array();    $query = "select name,adresse client token = '".$_session['token']."'";  $result = mysqli_query($connect, $query);    if(mysqli_num_rows($result) > 0)    {         while($row = mysqli_fetch_array($result))         {              $output[] = $row;         }         echo json_encode($output);    }     ?> 

you trying access content of "token" in $_session, must add check beforehand ensure "token" in array named $_session. encountered error because session not hold "token" data (a var_dump / print_r on $_session should confirm that).

add following:

if (empty($_session['token'])) {   // output error message, or take specific action handle case.   return; }