Cakephp how to create a nested foreach - foreach

Question

I am using cakephp 3. I have to create a view for a Group in which in every Subject, there will be Lessons but in my case:
Group hasMany subjects
Subject hasMany lessons
Here is my code in the GroupsController:
public function mygroup()
{
$this->loadModel('Lessons');
$group = $this->Groups->get($this->Auth->user('group_id'), [
'contain' => ['Subjects', 'Users']
]);
$lesson = $this->Lessons->find('all');
$this->set('lesson', $lesson);
$this->set('_serialize', ['lesson']);
$this->set('group', $group);
$this->set('_serialize', ['group']);
}
I have to load lessons model because it is not associated with group, in mygroup.ctp view:
<?php if (!empty($group->subjects)): ?>
<?php foreach ($group->subjects as $subjects): ?>
<?= h($subjects->subject) ?>
<?= h($subjects->id) ?>
<?= h($subjects->created) ?>
<?php foreach ($lesson as $lesson): ?>
<?php if ($subjects->id == $lesson->subject_id): ?>
<?= h($lesson->lesson) ?>
<?= h($lesson->subject_id) ?>
<?= h($lesson->created) ?></div>
<?php endif; ?>
<?php endforeach; ?>
<?php endforeach; ?>
<?php endif; ?>
I want to view lesson just below of its subject where it belongs. I don't know but the for each loop for the subject is working but the for each loop of lessons it only work for the first subject it displays:
Something like this:
Subject1
Lesson1 for sub1
Lesson2 for sub1
Lesson3 for sub1
Subject2
Subject3
Subject4
Subject5
The lessons are not showing in the subject 2 to 5 yet there should be.
Can u help me with this? Or is there any other way to do it? If there someone. Very much appreciate it. Thank you