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index.php

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<?php
session_start
();

require_once 
"functions/database.php";

function 
attempt_login($username$password)
{
    global 
$db;
    
$result $db->query("SELECT userId, `password` FROM accountData WHERE username = :username", array("username"=>$username));
    if (!
$result)
        return 
null;
    
var_export($result);
    
$hash hash("sha256"$passwordfalse);
    echo 
"<br>" $result["password"] . "<br>";
    echo 
$hash;
    if (
$result["password"] == $hash)
        return 
$result["userId"];
    return 
null;
}

$login_failed=false;
if(isset(
$_POST["submit"])){
    
$userID attempt_login($_POST["username"], $_POST["password"]);
    if (
$userID)
        
$_SESSION["userID"] = $userID;
    else
        
$login_failed true;
}

if(isset(
$_SESSION["userID"])){
    
header("location: account.php");
    exit();
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Inloggning, Olivers bank</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
<form action="" method="post" enctype="multipart/form-data" autocomplete="off">
    <h2>Logga in</h2>
    <label>Användarnamn</label>
    <input type="text" name="username">

    <label>Lösenord</label>
    <input type="password" name="password">

    <button type="submit" name="submit">Logga in</button>

    <p class="error"><?php if ($login_failed) echo "Felaktigt användarnamn eller lösenord." ?></p>
    </form>
    <a href="signup.php">Skapa konto istället</a>
</body>