Question

I have a three dimensional array. I want to right a function to transform it to a single dimensional array and keep the previous sub-key. How do I do that?

array(2) {
[0]=>
 array(2) {
  [0]=>
   array(2) {
     ["id"]=>
     string(1) "4"
     ["assignedlessons"]=>
     string(2) "69"
   }
  [1]=>
   array(2) {
     ["id"]=>
     string(1) "4"
     ["assignedlessons"]=>
     string(3) "308"
   }
}
array(2) {
  [0]=>
   array(2) {
     ["id"]=>
     string(1) "10"
     ["assignedlessons"]=>
     string(2) "50"
   }
  [1]=>
   array(2) {
     ["id"]=>
     string(1) "10"
     ["assignedlessons"]=>
     string(2) "91"
    }
  }
}

I want to transform it to the structure like this one:

   array(0) {
     ["id"]=>
     string(1) "4"
     ["assignedlessons"]=>
     string(2) "69"
   }

   array(1) {
     ["id"]=>
     string(1) "4"
     ["assignedlessons"]=>
     string(3) "308"
   }

   array(2) {
     ["id"]=>
     string(1) "10"
     ["assignedlessons"]=>
     string(2) "50"
   }
   array(3) {
     ["id"]=>
     string(1) "10"
     ["assignedlessons"]=>
     string(2) "91"
    }

What I have is this function:

function toSingleDimentionalArray($array){
 $final = array();
 foreach($array as $value){
   foreach($array as $key => $val){
      $final[]['id'] = $val['id'];  
      $final[]['assignedlessons'] = $val['assignedlessons'];
    }

 }
 return $final;
}

But it only return something like this:

array(19648) {
  [0]=>
  array(1) {
  ["id"]=>
 string(1) "4"
}
  [1]=>
  array(1) {
  ["assignedlessons"]=>
  string(2) "69"
}
  [2]=>
  array(1) {
  ["id"]=>
  string(1) "4"
}
  [3]=>
  array(1) {
  ["assignedlessons"]=>
  string(3) "308"
 }

Answer 1

This will work

function toNotActuallyASingleDimensionalArray($array) {
    $final = array();
    foreach($array as $subarray) {
        foreach($subarray as $val) {
            $final[] = $val;
        }
    }
    return $final;
}