Need to post data to different variable pages

Question

How do i post the variable to another page, so then it looks at the variable and redirects them to the right page.

<?php 
session_start();
error_reporting(E_ALL); ini_set('display_errors', 1);
require("includes/config.php");

// Require: use your own path
require_once 'morris.php';
require_once 'morris-charts.php';

// Optional: include chart line
require_once 'morris-line-charts.php';
//if not logged in redirect to login page
if(!$user->is_logged_in()){ header('Location: login.php'); } 

//define page title
$title = "Predict a Student's Grade";

?>
<!DOCTYPE html>
<html>



<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Past Student</title>

    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">




    <!-- Custom Fonts -->
    <link href="font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">


    <script src="js/bootstrap.min.js" type="text/javascript"></script>
    <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css">
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
    <script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script>

</head>

<body>




<?php 

    //posted form data
    if (isset($_POST['name'])) {


        $name     = $_POST['name'];
        $subject1 = $_POST['subject1'];
        $grade1   = $_POST['grade1']; 
        $subject2 = $_POST['subject2'];
        $grade2   = $_POST['grade2'];
        $subject3 = $_POST['subject3'];
        $grade3   = $_POST['grade3'];
        $subject4 = $_POST['subject4'];
        $grade4   = $_POST['grade4'];
        $attendance = $_POST['attendance'];
        $gender     = $_POST['gender'];

          // <--------------Validation for form Post----------------------->




        $error = true;

        //validation make sure  2 of the same subjects haven't been chosen 
        if ($subject1 == $subject2 or $subject1 ==  $subject3 or  $subject1 == $subject4) {
           $error = false;
          } 
        elseif ($subject2 == $subject1 or $subject2 == $subject3 or $subject2 == $subject4) {
          $error = false;

          }
        elseif ($subject3 == $subject1 or $subject3 == $subject2 or $subject3 == $subject4) {
             $error = false;
            }
            // checks if the data entered is an integer 

      elseif ( is_int( $attendance ) && $attendance >= 0 && $attendance <= 100 ) {
      $error = false; // If the above condition is met, $error is set to false
    }



  if ($error == true){ 



      //selecting from the database

       $query = $db->prepare("SELECT * FROM paststudent WHERE subject1 = :subject1 AND grade1 = :grade1");
        $query->bindValue(':subject1', $subject1, PDO::PARAM_STR);
        $query->bindValue(':grade1', $grade1, PDO::PARAM_STR);
        $query->execute();
        $result = $query->fetch(PDO::FETCH_ASSOC);
    // fetch() instead of fetchAll just gets the first result

    // Output the predicted grade (or any item from the array) like this

    }
    else {
        header("location:error.php");
    }
    }?>

<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="jumbotron">

                <h1>

                  <?php 
                      if (empty($result['final_maths'])) {
                        header('location:error.html');
                       }
                       else {
                           echo "<h1>The predicted grade for " . $name . " is a " . $result['final_maths'] . "</h1>";
                                $grade = $result['final_maths'];
                                $_SESSION['predict'] = $grade;
                            }
                        ?>
                                           <!-- Button -->
                        <form action="sort.php " method="POST">

                       <input type="submit" name="graph" value ="graph"/>
                       </form>



                <p>
                    Please remember that these predictions does not mean the student will get this grade
                    <br>
                    <i> "It always seems impossible until it is done" </i>

                </p>


                <a class="btn btn-primary btn-lg btn-block" href="memberpage.php" role="button">Home  &#x2302;</a>

            </div> 
        </div>
    </div>
    </form>
    </fieldset>
</div>


</body>
</html>

There is a sort page that redirects to user to the right page when they click submit

<?php 
session_start();
error_reporting(E_ALL); ini_set('display_errors', 1);
require("includes/config.php");
$grade = $_SESSION['graph'];

// Require: use your own path
require_once 'morris.php';
require_once 'morris-charts.php';

// Optional: include chart line
require_once 'morris-line-charts.php';
//if not logged in redirect to login page
if(!$user->is_logged_in()){ header('Location: login.php'); } 

//define page title
$title = "Predict a Student's Grade";

if ($grade == "A") {

    header("location:graphaa.html");
}





?>

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Furquan Ahmad

Furquan Ahmad

Need to post data to different variable pages