read .txt file content into php multi dimensional array - php

Question

I have a .txt file with content like this
Abuja, the Federal Capital Territory has -- -- -- -- -- area Council
A. 4
B. 6
C. 7
D. 2
ANSWER: B
The Federal Capital Territory is associated with-- -- -- -- -- -- -- vegetation belt
A. Sahel savanna
B. Rainforest
C. Guinea savanna
D. Sudan savanna
ANSWER: C
The most significant factor responsible for the ever increasing population of FCT is
A. High birth rate
B. Immigration
C. Death rate
D. CENSUS
ANSWER: B
i would love to read the file content into a multi dimensional array so i can get each questions, its answers and the correct answer for each of the questions.
i have tried this:-
$array=explode("\n", file_get_contents('file.txt'));
print_r($array);
but it doesn't give me what i want..

Answer 1

Alives answer gives a result that you probably can work with, but I think associative array is probably the way to go.
I look at each line to see if it has a question number => add new item in array with question number and question text.
If first char is letter and second is a dot, it's an answer => add answer letter as key and text as value.
If it's none of above it's the answer text => add key with ANSWER and value as the correct answer.
I use explode to split the lines. The third argument tells how many parts to split the string in.
With "2" it splits at first space meaning I have the question# as item 1 and question text as item 2 in the array.
https://3v4l.org/ZqppN
// $str = file_get_contents("text.txt");
$str = "1. Abuja, the Federal Capital Territory has -- -- -- -- -- area Council
A. 4
B. 6
C. 7
D. 2
ANSWER: B
2. The Federal Capital Territory is associated with-- -- -- -- -- -- -- vegetation belt
A. Sahel savanna
B. Rainforest
C. Guinea savanna
D. Sudan savanna
ANSWER: C
3. The most significant factor responsible for the ever increasing population of FCT is
A. High birth rate
B. Immigration
C. Death rate
D. CENSUS
ANSWER: B";
$arr = explode("\n", $str);
$res=[];
Foreach($arr as $line){
If($line != ""){
If(is_numeric($line[0])){
Preg_match("/^\d+/", $line, $num);
$res[$num[0]] =["QUESTION" =>explode(" ", $line,2)[1]];
$q = $num[0];
}Else if(ctype_alpha($line[0]) && $line[1] == "."){
$res[$q][$line[0]] = explode(" ", $line, 2)[1];
}Else{
$res[$q]["ANSWER"] = trim(explode(":", $line, 2)[1]);
}
}
}
Var_dump($res);

Answer 2

Try This..
$array=explode("\n", file_get_contents('file.txt'));
$array = array_filter(array_map('trim',$array));
$chunk_array = array_chunk($array, 6);
foreach($chunk_array as $key => $value){
$final_array[$key]['question'] = $value[0];
$final_array[$key]['options'] = array_slice($value, 1, -1);
$final_array[$key]['answer'] = end($value);
}
echo '<pre>';
print_r($final_array);
echo '</pre>';