student distribute in exam hall using codeigniter - php

Question

I have three table for student first one is roll_no
second is center details
third is rooms details
$anil = array();
$exam_no_students = array();
$session_usr['user']= $this->session->userdata('user_name');
$total_students['total_stu']=$this->DBfunction->totalCountAll('roll_no');
$exam_centers['no_of_centers']= $this->DBfunction->count_centers();
$exam_centers1= $this->DBfunction->count_centers();
foreach ($exam_centers1 as $center_code => $center_details){
$center_code = array('center_id' =>$center_details->center_id);
$center_table='exam_center';
$center_full_details =$this->DBfunction->getArrayWhereResult($center_table,$center_code);
foreach ($center_full_details as $full => $full_de) {
$fullstudent = array('center_f_id' =>$full_de->center_id,
'center_f_name' =>$full_de->exam_center,
'center_f_addres' =>$full_de->exam_center_address ,
'center_f_city' =>$full_de->village ,
'center_f_count' =>$center_details->count);
}
array_push($exam_no_students, $fullstudent);
$center_f_details =$this->DBfunction->getArrayWhereResult($center_table,$center_code);
foreach ($center_f_details as $roomss => $rooms) {
$room_id = array('exam_center_id' =>$rooms->id);
$center_rooms =$this->DBfunction->getArrayWhereResult('exam_center_rooms',$room_id);
foreach ($center_rooms as $rooms_c => $roomsdetails) {
$center_with_rooms['anil'] = array('center_id'=>$rooms->center_id,
'center_name'=>$rooms->exam_center,
'center_main'=>$roomsdetails->exam_center_id,
'no_of_students'=>$center_details->count,
'room_no'=>$roomsdetails->room_no,
'no_of_seating'=>$roomsdetails->noofseating, 'noofrow'=>$roomsdetails->noofrow,
'noofcol'=>$roomsdetails->noofcol
);
}
}
I want to assign student into rooms for exam like below table
i am so confused to do this.

Answer 1

I got solution for above mentioned query using array_slice(). and get desired result.
public function Student_shift(){
$stateus='Approved';
$statuss = array('status' =>$stateus);
$table ='exam_center';
$get_centers=$this->DBfunction->getArrayWhereResult($table,$statuss);
$new_array = array();
foreach ($get_centers as $centers => $centers_name){
$i=1;
$centerid=$centers_name->center_id;
$main_id = $centers_name->id;
$center_where = array('center_id' =>$centerid);
$roll_table='roll_no';
$all_center_student = $this->DBfunction->getArrayWhereResult($roll_table,$center_where);
$all_center_student_count=count($all_center_student);//die;
$rooms_where = array('exam_center_id' =>$main_id);
$room_table= 'exam_center_rooms';
$rooms_details= $this->DBfunction->getArrayWhereResult($room_table, $rooms_where);
$cout = count($all_center_student);
$diff_diff=$all_center_student;
$start =0;
$shift=1;
$rooms_seating = 0;
while ($diff_diff){
$start =0;
$rooms_seating = 0;
$i=0;
ini_set('max_execution_time', 0);
ini_set('memory_limit','2048M');
foreach ($rooms_details as $roo => $rooms_ava){
$sliced_array = array_slice($diff_diff, $start, $rooms_ava->noofseating-2);
$start = $rooms_ava->noofseating-2;
foreach ($sliced_array as $key1 => $all) {
$students_with_rooms = array('enrollment' =>$all->enrollment,
'center_id' =>$all->center_id,
'roll_no' =>$all->roll_no,
'stu_class' =>$all->stu_class,
'room_no' =>$rooms_ava->room_no,
'shift_id'=>$shift
);
$roll_where = array('roll_no' => $all->roll_no);
$table='roll_no';
$data = array('room_no' => $rooms_ava->room_no,
'shift_id'=>$shift
);
$this->DBfunction->updateArrayWhereResult($table, $roll_where, $data);
array_push($new_array, $students_with_rooms);
}
$rooms_seating = $rooms_seating+$rooms_ava->noofseating-2;
$i++;
}
$diff_diff = array_slice($diff_diff, $rooms_seating);
$shift++;
}
}
redirect('Admin/abcd');
}