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`edit_user.php`

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<?php
require_once("check_login.php");
require_once("database_connection.php");

$userId = trim($_GET['userId']);    # Hämta vilket id som ska 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));
# fetch() 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=, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie-edge">
    <title>Lägg till användare</title>
    <link rel="stylesheet"
    href ="https://unpkg.com/spectre.css/dist/spectre.min.css">
</head>
    
<body>
    <div class="container">
        <div class="columns">
            <div class="column col-4">
                <h1>Inloggnignsapplikationen</h1>
                <p>Uppdatera information om användare</p>
    <form method="POST" action="update_user.php">
        <div class="form-group">
            <input type="hidden" name="userId" value="<?php echo $userId;?>">
            <label class="form-label" for="username">Användarnamn</label>
            <input class="form-input" id="username" name="username" type="text"
             value="<?php echo $res['username'];?>" required>

            <label class="form-label" for="password">Lösenord</label>
            <input class="form-input" id="password" name="password" type="password"
             value="<?php echo $res['password'];?>" required>
            <p></p>
            <input type="submit" class="btn btn-primary" value="Uppdatera">
        </div>
    </form>
</div>
</div>
</div>
</body>
</html>