Question

I have a 2 dimension array with the help of Baba and now I am in problem again as I need to add [exam] => testOne and [exam_id] => 1 to all inner arrays

array
  0 => 
    array
      'id' => string '7' (length=1)
      'name' => string 'Name 1' (length=6)
      'marks' => string '8' (length=1)
      'grade' => string '4' (length=1)
  1 => 
    array
      'id' => string '8' (length=1)
      'name' => string 'Name 2' (length=6)
      'marks' => string '5' (length=1)
      'grade' => string '2.5' (length=3)
  2 => 
    array
      'id' => string '9' (length=1)
      'name' => string 'another name' (length=12)
      'marks' => string '8' (length=1)
      'grade' => string '4' (length=1)

I need to add
[exam] => testOne and [exam_id] => 1 to all inner arrays want results as follwing

array
  0 => 
    array
      'exam_id' =>'1'
      'exam' => 'testOne'
      'id' => string '7' (length=1)
      'name' => string 'Name 1' (length=6)
      'marks' => string '8' (length=1)
      'grade' => string '4' (length=1)
  1 => 
    array
      'exam_id' =>'1'
      'exam' => 'testOne'
      'id' => string '8' (length=1)
      'name' => string 'Name 2' (length=6)
      'marks' => string '5' (length=1)
      'grade' => string '2.5' (length=3)
  2 => 
    array
      'exam_id' =>'1'
      'exam' => 'testOne'
      'id' => string '9' (length=1)
      'name' => string 'another name' (length=12)
      'marks' => string '8' (length=1)
      'grade' => string '4' (length=1)

This is such a great place for learners like me.

Answer 1

You can try

foreach ( $final as &$var ) {
    $var['exam'] = "testOne";
    $var['exam_id'] = "1";
}

var_dump($final);

If you want to retain the keys on top (As Requested)

$addOn = array("exam" => "testOne","exam_id" => 1);
end($addOn);
foreach ( $final as &$var ) {
    $var = array_merge($addOn, $var);
}
var_dump($final);