questionsandanswers.php

I have two arrays, questions and answers. I need to merge them together so in question there are its answer if it have answer.

This is how it should look like:
array(‘questions’ => 
	array(‘id’=> 1, 
		    ’question’ => ‘How sick you are’,
        ‘answer’ => 3))

And if there are no answer it should only show the question.

Questions array:
array(‘Questions => 
	array(‘id’ => 1, 
		    ‘question’ => ‘How sick you are’))

Answers array:
array(‘Answers =>
	array(‘id’ => 5,
		    ‘question_id => ‘1’,
		    ‘answer’ => ‘3’))

I have been trying to foreach the Questions and Answers like this,

foreach($questions as $key_kys => $value_kys){
                foreach($answers as $key_vas => $value_vas){
                    if($value_kys['TherapygroupQuestions']['id'] == $value_vas['TherapygroupAnswers']['question_id']){
                       $questions['vastaus'] = $value_vas['TherapygroupAnswers']['vastaus'];
                       $questions['vastaus_id'] = $value_vas['TherapygroupAnswers']['id'];
                    }

                }

And with array_merge or array_push.