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editUser.php

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<?php
require_once('check_login.php');          # Kollar om vi är inloggade
require_once('database_connection.php');  # Läs in databaskopplingen

$userId = trim($_GET['userId']);           # hämta vilket id som skall uppdateras

# Bygg upp SQL-sats och gör anropet till databasen
$sql = "SELECT * FROM user WHERE userId = :userId;";
$stm = $pdo->prepare($sql);
$stm->execute(array('userId' => $userId));

# eftersom vi hämtar en post
$res = $stm->fetch(PDO::FETCH_ASSOC);
?>
<!DOCTYPE html>
<html lang="sv">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Uppdatera användare</title>

    <!-- Bulma -->
    <link rel="stylesheet" href="bulma.css">
</head>
<body>

<section class="section">
    <div class="container">
        <div class="columns is-centered">
            <div class="column is-4">

                <h1 class="title">Inloggningsapplikationen</h1>
                <p class="subtitle">Uppdatera information om användare</p>

                <form method="POST" action="updateUser.php">
                    <input type="hidden" name="userId" value="<?php echo $userId; ?>">

                    <div class="field">
                        <label class="label" for="username">Användarnamn</label>
                        <div class="control">
                            <input class="input" id="username" name="username"
                                   type="text" value="<?php echo $res['username']; ?>" required>
                        </div>
                    </div>

                    <div class="field">
                        <label class="label" for="password">Lösenord</label>
                        <div class="control">
                            <input class="input" id="password" name="password"
                                   type="password" value="<?php echo $res['password']; ?>" required>
                        </div>
                    </div>

                    <div class="field">
                        <button class="button is-primary is-fullwidth">
                            Uppdatera
                        </button>
                    </div>
                </form>

            </div>
        </div>
    </div>
</section>

</body>
</html>