Redirect loop issue in PHP website - php

Question

I have been working on CS50's problem set 7, in which we have to make a financial website using MVC. I completed the website and it is working absolutely fine on my local machine.
But when I upload the files to hosting (free) service's server and try to access it I get a Redirect Loop error. Here is the link to it: http://ghazilajpal.byethost6.com/finance/public/
Here is code of login.php:
<?php
// configuration
require("../includes/config.php");
// if user reached page via GET (as by clicking a link or via redirect)
if ($_SERVER["REQUEST_METHOD"] == "GET")
{
// render form
render("login_form.php", ["title" => "Log In"]);
}
// else if user reached page via POST (as by submitting a form via POST)
else if ($_SERVER["REQUEST_METHOD"] == "POST")
{
// validate submission
if (empty($_POST["username"]))
{
apologize("You must provide your username.");
}
else if (empty($_POST["password"]))
{
apologize("You must provide your password.");
}
// query database for user
$rows = query("SELECT * FROM users WHERE username = ?", $_POST["username"]);
// if we found user, check password
if (count($rows) == 1)
{
// first (and only) row
$row = $rows[0];
// compare hash of user's input against hash that's in database
if (crypt($_POST["password"], $row["hash"]) == $row["hash"])
{
// remember that user's now logged in by storing user's ID in session
$_SESSION["id"] = $row["id"];
$_SESSION["cash"] = $row["cash"];
// redirect to index.php (portfolio)
redirect("/");
}
}
// else apologize
apologize("Invalid username and/or password.");
}
?>
Update
Here is login_form.php:
<form action="login.php" method="post">
<fieldset>
<div class="form-group">
<input autofocus class="form-control" name="username" placeholder="Username" type="text"/>
</div>
<div class="form-group">
<input class="form-control" name="password" placeholder="Password" type="password"/>
</div>
<div class="form-group">
<button type="submit" class="btn btn-default">Log In</button>
</div>
</fieldset>
</form>
<div>
or register for an account
</div>
And this is config.php. This also has a redirect:
<?php
/**
* config.php
*
* Computer Science 50
* Problem Set 7
*
* Configures pages.
*/
// display errors, warnings, and notices
ini_set("display_errors", true);
error_reporting(E_ALL);
// requirements
require("constants.php");
require("functions.php");
// enable sessions
session_start();
// require authentication for all pages except /login.php, /logout.php, and /register.php
if (!in_array($_SERVER["PHP_SELF"], ["/login.php", "/logout.php", "/register.php"]))
{
if (empty($_SESSION["id"]))
{
redirect("login.php");
}
}
?>
I hope its easy to understand. I don't know where the problem lies and how to fix it.
I could have asked it on cs50.stackexchange.com but a similar question is already there with no answer.

Answer 1

Is it coming in this code block always?
if (crypt($_POST["password"], $row["hash"]) == $row["hash"])
{
// remember that user's now logged in by storing user's ID in session
$_SESSION["id"] = $row["id"];
$_SESSION["cash"] = $row["cash"];
// redirect to index.php (portfolio)
redirect("/");
}
if yes then here have a probelm.
change redirect with die(); to verify.
And Please provide some more inputs from you to clarify more.

Answer 2

I did some debugging using bhushanRJ's advice of using die (). And found out that the issue is with URLs. So using /finance/public/login.php instead of just login.php (same for other array items) solved the issue.
However CSS and JS files weren't loading. Similarly, fixing their URLs in templates fixed the issue.

Answer 3

When I got a loop it was because I hadn't started the session by putting "session_start()"