Efficient way to segregate data in php - php

Question

I am using Laravel and I want to retrieve the data using Eloquent.
My controller:
public function getquesdet(){
$id = Request::input('id');
$question = Question::where('q_id','=',$id)->with('qtags.tags')->with('comments')->with('answers')
->first();
$i=0;
$tagnames[]=0;
foreach ($question['qtags'] as $value) {
$tagnames[$i] = $value['tags']['tag'];
$i++;
}
$j=0;
$comments[]=0;
foreach ($question['comments'] as $value) {
$comments[$j] = $value['comment'];
$j++;
}
$k=0;
$answers[]=0;
foreach ($question['answers'] as $value) {
$answers[$k] = $value['answer'];
$k++;
}
return array('question'=>$question['title'],'body'=>$question['body'],'tags'=>$tagnames,'comments'=>$comments,'answer'=>$answers);
}
As you can see, I feel that the usage of foreach loops is not efficient. Using for loops might take more time. All I want is to know that if there is any efficient workaround to this.
The $question is returned as :

Answer 1

I think that looks like an efficient solution. Three for loops after each other gives complexity O(3n) -> O(n) which is good and should be fast. If you have very large collections of comments, tagnames and questions I would try to solve the problem at SQL level which should be even faster, but for small resultsets this should be good enough.
Big O notation

Answer 2

If you want selected columns from the table then you can use select() method as:
$question = Question::where('q_id','=',$id)
->select('title', 'body')
->with([
'qtags' => function($q) {
$q->select('tag');
},
'qtags.tags' => function($q) {
$q->select('comment');
},
'answers' => function($q) {
$q->select('answer');
}
])
->first();
Then you can return it as an array:
return $question->toArray();
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