GetUsers.php

<?php
include "connection.php";

$json = file_get_contents('php://input');
$obj = json_decode($json,true);

$email = $obj['email'];
$password = $obj['password'];

if($obj['email'] != ""){
    $result = $mysqli->query("SELECT* FROM users WHERE Username = '$email' AND Password = '$password'");
    if($result->num_rows == 0){
        echo json_encode("Wrong details");
    }else{
        echo json_encode("OK");
    }

}else{
    echo json_encode("Try again");
}




/*echo json_encode(array(
    'message' => 'The message has been been returned from backend'
));*/

?>