<input id="username" type="username" name="" placeholder="Username">
            <input id="password" type="password" name="" placeholder="Password"><br>
            <button type="button" class="btn btn-primary" id="submit-login"> Login</button>

$("#submit-login").on("click", function(){
    userLogin();
    });
function userLogin(){
    userLogin = $("#username").val();
    userPass = $("#password").val();
        $.ajax({
            type: 'POST',
            url: 'controllers/login.php',
            data: {
                'username': userLogin,
                'password' : userPass
            },
            success: function(responseText) {
                console.log(responseText);
            }
        });
};

<?php
$savedUser = "irexjr";
$savedPass = "1234";

$request_user = $_POST['username'];
$request_password = $_POST['password'];

$loginsuccess = "";

if(($request_user == $savedUser) && ($request_password == $savedPass)){
    echo 1;
}
else{
    echo 0;
}
?>