Cant parse multi-array - php

Question

I am trying to parse this array in order to save it in the database, but I can't do it.
This is what $this->input->post("question") produces:
Array
(
[1] => Array
(
[0] => question 1
[answer] => Array
(
[0] => answer 1
[1] => answer 2
[2] => answer 3
[3] => asnwer 4
[4] => answeer 5
)
)
[2] => Array
(
[0] => queston 2
[answer] => Array
(
[0] => answer 21
[1] => answere 22
[2] => anwer 23
[3] => answer 24
[4] => answer 25
)
)
)
I tried this:
foreach ($this->input->post("question") as $questions) {
foreach ($questions as $question) {
$data = array(
'question' => $question,
);
$this->db->insert('questions', $data);
$question_id = $this->db->insert_id();
//another foreach to go throw answers
}
}
Just to check if I save the questions correctly, but I am getting this message:
Message: Array to string conversion

Answer 1

First of all, you are getting that message because you are trying to convert an array to a string.
Second:
foreach ($this->input->post("question") as $questions) {
}
first level. After this, you remain with:
[1] => Array
(
[0] => question 1
[answer] => Array
(
[0] => answer 1
[1] => answer 2
[2] => answer 3
[3] => asnwer 4
[4] => answeer 5
)
)
foreach ($this->input->post("question") as $questions) {
foreach ($questions as $question) {
//here, $question is formed of 2 arrays
//[0] => question 1
//[answer] => Array
// (
// [0] => answer 1
// [1] => answer 2
// [2] => answer 3
// [3] => asnwer 4
// [4] => answeer 5
// )
}
}
that is the second level. so in that foreach, you should use:
$data = array(
'question' => $question[0], // to get the question string
);
Let me know if anything more is needed!
P.S: for answers, you have to go one level deeper, and make another foreach.