quizSolutionContent.php

$userQuery = $pdo->prepare('SELECT pk_userid FROM users where username = :username');
$userQuery->execute($_SESSION);
$userid = $userQuery->fetchAll();

var_dump($userid);

$writeUser = $pdo->prepare('update users set bestQuizPoints = :points where username = :username');
$writeUser->execute(["username" => $_SESSION["username"], "points" => $points]);
echo "<br>reached " . $_SESSION["username"] . " " . $points;