Building an array in PHP with Codeigniter - php

Question

I'm trying to build an array in Codeigniter 3, but I cant seem to structure it properly.
I have 2 tables that I basically need to combine; questions and their associated answers.
SO, basically I need a multidimensional array, each inner array is to contain the question data along with its associated answer data.
This is what I'm doing at the moment:
$question_array = array();
foreach($course_object->result() as $question){
$question_array[] = array (
'question_id' => $question->question_id,
'question' => $question->question,
);
$answer_data = $this->get_answer_data($question->question_id);
foreach($answer_data as $answer){
$question_array[]['answer'] = $answer->answer;
$question_array[]['result'] = $answer->result;
}
}
return $question_array;
But that outputs each question as an array on its own, as well as each answer, i need to combine them somehow. This is what I'm getting:
array(2) {
["question_id"]=>
string(3) "548"
["question"]=>
string(29) "Who enforces fire safety law?"
}
array(1) {
["answer"]=>
string(11) "The Manager"
}
array(1) {
["result"]=>
string(1) "0"
}
array(1) {
["answer"]=>
string(18) "The Fire Authority"
}
array(1) {
["result"]=>
string(1) "1"
}
and this is what i need:
array(2) {
["question_id"]=>
string(3) "548"
["question"]=>
string(29) "Who enforces fire safety law?"
["answer"]=>
string(11) "The Manager"
["result"]=>
string(1) "0"
["answer"]=>
string(18) "The Fire Authority"
["result"]=>
string(1) "1"
}
I've tried things like array_push but I cant seem to get it to work?
Any ideas what I can try?

Answer 1

The easiest way to do it is to create a new array with what you need, and append it to the $question_array, like this. You'll need a new subarray for the answers, because you can't have duplicate keys in an array.
foreach($course_object->result() as $question){
$q_array = array (
'question_id' => $question->question_id,
'question' => $question->question,
'answers' => array()
);
$answer_data = $this->get_answer_data($question->question_id);
foreach($answer_data as $answer){
$q_array['answers'][] = array(
'answer' => $answer->answer,
'result' =>$answer->result
);
}
$question_array[] = $q_array;
}

Answer 2

I think this should work.
$question_array = array();
$i = 0;
foreach($course_object->result() as $question){
$question_array[$i] = array (
'question_id' => $question->question_id,
'question' => $question->question,
);
$answer_data = $this->get_answer_data($question->question_id);
foreach($answer_data as $answer){
$question_array[$i]['answer'][] = $answer->answer;
$question_array[$i]['result'][] = $answer->result;
}
$i++;
}
return $question_array;