0  HASH(0x80355e98)
   'classroomID' => 10
   'classroomName' => 'classroom1'
   'students' => ARRAY(0x80359e18)
      0  HASH(0x8006c050)
         'age' => 12
         'studentID' => 9534
         'studentName' => 'John'
         'studentSurname' => 'Something'
      1  HASH(0x8032f958)
         'age' => 13
         'studentID' => 5489
         'studentName' => 'Mary'
         'studentSurname' => 'Something2'