<?php

 include('database2.php');

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

    if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
        header("Access-Control-Allow-Methods: GET, POST, OPTIONS");

    if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
        header("Access-Control-Allow-Headers:        {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

    exit(0);
}

$conn = mysqli_connect($dbserver, $user, $pass, $db);

// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}

echo "Connected successfully";

 $postdata = file_get_contents("php://input");
if (isset($postdata)) {

//THE ERROR IS HERE
 $request = json_decode($postdata);
 $username = $request->username;
 $userpass = $request->userpass;

 $sql = sprintf("SELECT * FROM account_info   where a_username='%s' ",
 //WHERE User_Name='%s' AND User_Pass='%s'
        mysqli_real_escape_string($conn,$username),
        mysqli_real_escape_string($conn,$userpass));
$result=$conn->query($sql);
if ($result->num_rows>0)
{  $UserID=0;
  while($row=$result->fetch_assoc())
  {$UserID=$row["acc_id"];
  }
   $myobj=array();
   array_push($myobj,array('isloggedin'=>'true','userid'=>$UserID));
   echo json_encode($myobj);
}

  else
  {
    $myobj=array();
   array_push($myobj,array('isloggedin'=>'false'));
   echo json_encode($myobj);
   }
   }
?>