php - $SESSION not working despite numerous tries and search online -

i coding online quizzer using php. whenever answerer of quiz choose correct answer, code automatically +1 overall score.

to that, used $_session['score']=0; first set score 0 , $_session['score']++; whenever answerer gets answer correct each question.

however, have no idea why score not adding despite answerers answering questions correctly.

when answerer answers question correctly, score still 0 reason , have no idea why. may know went wrong? thank you.

things have tried:

1.changing $_session['score']++; $_session['score']+1;

2.changing:

if(!isset($_session['score'])){ $_session['score']=0; }

to

$_session['score']=0;

3.changing

if($correct_choice == $selected_choice){ $_session['score']++; }

to just:

if($correct_choice = $selected_choice){ $_session['score']++; }

below code process.php:

<?php include 'database.php'; ?> <?php session_start(); ?>  <?php   if(!isset($_session['score'])){     $_session['score']=0;  }  if(isset($_post['submit'])){     $number=$_post['number'];     $selected_choice = $_post['choice'];     $next=$number+1;     /*     *   total questions     */     $query="select* questions";     $results= mysqli_query($con,$query);     $total=$results->num_rows;     /*     *   correct choice     */     $query = "select* `choices` question_number = $number , is_correct=1";     //get result     $results= mysqli_query($con,$query);      //get row     $row=$results->fetch_assoc();      //set correct choices     $correct_choice=$row['id'];      //compare choice made correct choice     if($correct_choice == $selected_choice){         $_session['score']++;     }       //check if last question     if($number == $total){         header("location: final.php");         exit();     } else {         header("location: question.php?n=".$next);     }  } 

just tried something:

if($correct_choice == $selected_choice){         echo "same";     } else{         echo "not same";     } 

even though $correct_choice , $selected_choice both equals 1, code still returns "not same"?

you opening , closing lot of php tags - unnecessarily. if have error reporting on, , being displayed on screen, saying 'headers sent'. that, issue.

since process.php file php - open <?php tag once - , don't bother close @ end - unless explicitly outputting (which bad practice anyway larger program, better use small framework, , separate templates).