function validate()
{
    include "wines.php";
    $username = $_REQUEST['username'];
    $password = $_REQUEST['password'];
    $obj = new wines();
    $obj->connect();
    $obj->validation($username, $password);
    if ($row = $obj->fetch()) {
        echo '{"status":1, "message":"User found"}';
    } else {
        echo '{"status":0, "message":"User not found"}';
    }
}
<?php

if (isset($_REQUEST['uname'])) {
    session_start();
    include_once "wines.php";
    $uname = $_REQUEST['uname'];
    $p_word = $_REQUEST['pwd'];
    $obj = new wines();
    $row = $obj->validation($uname, $p_word);
    if (!$row) {
        echo "Ooops! Wrong credentials... :(";
    } else {
        $_SESSION['cust_id'] = $row['cust_id'];
        $_SESSION['uname'] = $row['user_name'];
        $_SESSION['pwd'] = $_REQUEST['password'];
        header("location:viewAfterLogIn.php");
    }
}
?>
<html>
	<head>
		<title>Sign-In</title>
		<script src="jquery-2.1.3.js"></script>
	<script>
	
		function sendRequest(requestURL){
			var obj = $.ajax({url:requestURL, async:false});
			var response =$.parseJSON(obj.responseText);
			return response;	
		}