PHP Manipulate associative array - php

Question

I'm using PHP in doing our exercise which is to get the necessary details of a user and the quiz he/she took.
This is my code so far.
<?php
require("dbOption/Db.class.php");
$db = new Db();
$data = array();
$quiz = array();
$easy = "";
$normal = "";
$hard = "";
// SELECT id, course FROM quizz WHERE course = 2
$res_quizz = $db->query("SELECT id, course FROM quizz WHERE course = :course", array("course"=>2));
foreach ($res_quizz as $key => $value) {
$quizzid = $value['id'];
// SELECT easy, normal, hard, userid FROM quizzscore WHERE quizid = $quizid
$res_quizzscore = $db->query("SELECT easy, normal, hard, userid, quizzid FROM quizzscore WHERE quizzid = :quizzid", array("quizzid"=>$quizzid));
foreach ($res_quizzscore as $key => $value2) {
$easy = $value2['easy'];
$normal = $value2['normal'];
$hard = $value2['hard'];
$quizzid = $value2['quizzid'];
$userid = $value2['userid'];
$q = array(
'Qz'.$quizzid => array(
'easy' =>$easy,
'normal' =>$normal,
'hard' =>$hard,
)
);
$quiz['quizzes'] = $q;
// SELECT name FROM USER WHERE id = $userid
$res_user = $db->query("SELECT name FROM user WHERE id = :id", array("id"=>$userid));
foreach ($res_user as $key => $value3) {
$name = $value3['name'];
}
}
$data[$userid] = array();
$data[$userid]['name'] = $name;
$data[$userid]['quizzes'] = $quiz;
echo "<pre>";
print_r($data);
echo "<pre/>";
}
The array is poorly manipulated and that's why I'm getting this result.
Array
(
[1] => Array
(
[name] => John Smith
[quizzes] => Array
(
[quizzes] => Array
(
[Qz1] => Array
(
[easy] => 5
[normal] => 6
[hard] => 7
)
)
)
)
)
Array
(
[1] => Array
(
[name] => John Smith
[quizzes] => Array
(
[quizzes] => Array
(
[Qz2] => Array
(
[easy] => 3
[normal] => 4
[hard] => 5
)
)
)
)
)
What I want to have is this kind of result.
Array
(
[1] => Array
(
[name] => John Smith
[quizzes] => Array
(
[quizzes] => Array
(
[Qz1] => Array
(
[easy] => 5
[normal] => 6
[hard] => 7
)
[Qz2] => Array
(
[easy] => 3
[normal] => 4
[hard] => 5
)
)
)
)
)
Any ideas would be most appreciated.