Convert Simple array to below result array - php

Question

I am using php
Below is my array
Array
(
[0] => Q .
[1] => What are the factors of x2+2x+1?
[2] => A .
[3] => (x+1)
[4] => B .
[5] => (x-1)
[6] => C .
[7] => (2x+1)
[8] => D .
[9] => (2x-1)
[10] => S .
[11] => (x+1)
[12] => M.
[13] => 20
[14] => Q .
[15] => Test are the factors of x2-2x+1?
[16] => A .
[17] => (x+1)
[18] => B .
[19] => (x-1)
[20] => C .
[21] => (2x+1)
[22] => D .
[23] => (2x-1)
[24] => S .
[25] => (x-1)
[26] => M.
[27] => 5
)
And i want result in
Array
(
[0] => Array
(
[question] => What are the factors of x2+2x+1?
[A.] => (x+1)
[B.] => (x-1)
[C.] => (2x+1)
[D.] => (2x-1)
[S.] => (x+1)
[M.] => 20
)
[0] => Array
(
[question] => TEST What are the factors of x2+2x+1?
[A.] => (x+1)
[B.] => (x-1)
[C.] => (2x+1)
[D.] => (2x-1)
[S.] => (x+1)
[M.] =>
)
)
Please Advise.

Answer 1

You could do it like this:
$array = Array
(
0 => "Q .",
1 => "What are the factors of x2+2x+1?",
2 => "A .",
3 => "(x+1)",
4 => "B .",
5 => "(x-1)",
6 => "C .",
7 => "(2x+1)",
8 => "D .",
9 => "(2x-1)",
10 => "S ." ,
11 => "(x+1)" ,
12 => "M." ,
13 => "20" ,
14 => "Q ." ,
15 => "Test are the factors of x2-2x+1?" ,
16 => "A ." ,
17 => "(x+1)" ,
18 => "B ." ,
19 => "(x-1)" ,
20 => "C ." ,
21 => "(2x+1)" ,
22 => "D ." ,
23 => "(2x-1)" ,
24 => "S ." ,
25 => "(x-1)" ,
26 => "M." ,
27 => "5" ,
);
$keys = array(
'question','A. ','B. ','C. ','D. ','S. ','M. '
);
$result = array_map(
function($q) use ($keys) {
return array_combine($keys, $q); // 4. make our keys the keys of each resulting array
},
array_chunk(
array_map(
function($a){
return $a[1]; // 2. select only the 2nd part of the chunk
},
array_chunk($array, 2) // 1. split initial array into chunks of 2
)
,7) // 3. split it into chunks of 7
);